Complex sentence: When Leo reverse engineers the portal, the Kraathatrogons are sucked in, with one of them ending up in the 80s' Teenage Mutant Ninja Turtles dimension.
Split into simpler sentences: When Leo reverse engineers the portal, the Kraathatrogons are sucked in. One of the Kraathatrogons ends up in the 80s' Teenage Mutant Ninja Turtles dimension.