Complex sentence: The two spar in the Cave until Tim stops to help Damian off the stuffed Tyrannosaurus jaws when Damian sucker punches Robin, leaves him for dead, and takes Jason Todd's displayed Robin uniform with him.
Split into simpler sentences: The two spar in the Cave until Tim helps Damian off the snapping Tyrannosaurus jaws. Damian then sucker punches Robin, leaves him for dead, and takes Jason Todd's displayed Robin uniform with him.