Complex sentence: Sharptooth is the main antagonist of "The Land Before Time": an extremely strong, athletic, and powerful "Tyrannosaurus", injured in pursuit of Littlefoot & Cera, but also the slayer of Littlefoot's mother.
Split into simpler sentences: Sharptooth is the main antagonist of "The Land Before Time". He is an extremely strong, athletic, and powerful "Tyrannosaurus", injured in pursuit of Littlefoot and Cera, but also the slayer of Littlefoot's mother.