Complex sentence: These trebuchets had a shooting range of around 100 meters, and could use projectiles of around 50 kg. During Mongol campaigns against Jin, the Mongols used about 5,000 trebuchets, and they were very successful in destroying the Jin fortresses.
Split into simpler sentences: These trebuchets had a shooting range of around 100 meters, and could use projectiles of around 50kg. During Yuan's campaign against Jin, Yuan used about 5,000 trebuchets, and they were very successful in destroying the Jin fortresses.