Complex sentence: In the original version of the tale, he was Hamato Yoshi's pet, in other versions he is Hamato Yoshi himself, but always mutated into the form of a human-sized rat.
Split into simpler sentences: In the original version of the tale, he is Hamato Yoshi's pet. In other versions he is Hamato Yoshi himself, but always mutated into the form of a human-sized rat.