Complex sentence: Finding Shaggy and Scooby, Jacques transforms into a cat creature and chases them to drain their lives, but thanks to the zombies, Shaggy and Scooby run away but accidentally tumble into the cave, interrupting the draining ceremony and distracting the cat creatures.
Split into simpler sentences: Finding Shaggy and Scooby, Jacques transforms into a cat creature and chases them to drain their lives. Thanks to the zombies, Shaggy and Scooby escape and accidentally tumble into the cave, interrupting the draining ceremony and distracting the cat creatures.