diff --git a/process_wiki_files.py b/process_wiki_files.py
new file mode 100644
index 0000000..526ae8a
--- /dev/null
+++ b/process_wiki_files.py
@@ -0,0 +1,126 @@
+from somajo import SoMaJo
+import os
+import re
+from multiprocessing import Pool, cpu_count
+
+# user settings
+INPUT_DIR = "data/dewiki-20220201"
+OUTPUT_DIR = "data/output"
+LANGUAGE = "de"
+# LANGUAGE = "en"
+
+tokenizer = SoMaJo(f"{LANGUAGE}_CMC")
+html_tag_patten = re.compile('<[^<>]+>')
+
+
+# see https://github.com/tsproisl/SoMaJo/issues/17
+def detokenize(tokens):
+    """Convert SoMaJo tokens to sentence (str)."""
+    result_list = []
+    for token in tokens:
+        if token.original_spelling is not None:
+            result_list.append(token.original_spelling)
+        else:
+            result_list.append(token.text)
+
+        if token.space_after:
+            result_list.append(" ")
+    result = "".join(result_list)
+    result = result.strip()
+    return result
+
+
+def is_doc_start_line(line):
+    return line.startswith('<doc id=')
+
+
+def is_doc_end_line(line):
+    return line.startswith('</doc>')
+
+
+def get_data_dirs(root_dir):
+    return [name for name in os.listdir(root_dir)
+            if os.path.isdir(os.path.join(root_dir, name))]
+
+
+def get_data_files(root_dir):
+    return [name for name in os.listdir(root_dir)
+            if os.path.isfile(os.path.join(root_dir, name))]
+
+
+def process_text_line(line):
+    # remove HTML taks if still there
+    line = re.sub(html_tag_patten, ' ', line)
+
+    sentences = tokenizer.tokenize_text([line])
+
+    result = []
+
+    for s in sentences:
+        sentence_string = detokenize(s)
+        result.append(sentence_string)
+
+    return result
+
+
+def process_directory(map_item):
+    input_dir, output_file_name = map_item
+    print("Creating:", output_file_name)
+    with open(os.path.join(OUTPUT_DIR, output_file_name), 'a') as output_file:
+        # r_=root, d_=directories, f_=files
+        data_files = get_data_files(input_dir)
+        for data_file in data_files:
+            next_input_file = os.path.join(input_dir, data_file)
+            print("Reading file:", next_input_file)
+
+            with open(next_input_file, "r") as input_file:
+
+                skip_next_line = False
+
+                for line in input_file:
+
+                    # drop line with start tag
+                    if is_doc_start_line(line):
+                        skip_next_line = True
+                        continue
+
+                    # drop line with end tag and append blank line
+                    if is_doc_end_line(line):
+                        output_file.write("\n")
+                        continue
+
+                    # skip first line to skip headline
+                    if skip_next_line:
+                        skip_next_line = False
+                        continue
+
+                    # skip empty lines
+                    if len(line) <= 1:
+                        continue
+
+                    sentences = process_text_line(line)
+
+                    for sentence in sentences:
+                        # ignore blank lines and make sure that stuff like "\n" is also ignored:
+                        if len(sentence) > 2:
+                            output_file.write(f"{sentence}\n")
+
+
+if __name__ == '__main__':
+    # get sub directories with data
+    data_dirs = get_data_dirs(INPUT_DIR)
+
+    # create tasks for parallel execution
+    task_list = []
+    for data_dir in data_dirs:
+        call_item = (os.path.join(INPUT_DIR, data_dir), data_dir + ".txt")
+        task_list.append(call_item)
+
+    pool_size = cpu_count() * 4
+    print("pool_size:", pool_size)
+
+    # execute tasks in parallel
+    with Pool(pool_size) as p:
+        p.map(process_directory, task_list)
+
+    print("Done!")