Complex sentence: As the mensa is twisted farther back, it meets another lug like the one that locked the string into position, this one pushes the trigger and automatically fires the polybolos, and the process is repeated.
Split into simpler sentences: As the mensa is twisted farther back, it meets another lug like the one that locked the string into position. This one pushes the trigger and automatically fires the polybolos, and the process is repeated.