Complex sentence: The turtles jump out of the windmill because Donatello did something with the machine, so instead of sending the Technodrome to Earth, the windmill is sent to Dimension X. The windmill reaches the dimensional portal and crashes right into the Technodrome.
Split into simpler sentences: The turtles jump out of the windmill because Donatello did something with the machine. Instead of sending the Technodrome to Earth, the windmill is sent to Dimension X. The windmill reaches the dimensional portal and crashes right into the Technodrome.