Complex sentence: These partisan bands were known as "plain-clothes" men from their lack of uniform were common citizens who took up arms in units called "Self-Protection Militia", "Anti-Japanese Militia" or "Chinese Volunteers".
Split into simpler sentences: These partisan bands were known as "plain-clothes" men from their lack of uniform. They were common citizens who took up arms in units called "Self-Protection Militia", "Anti-Japanese Militia" or "Chinese Volunteers".