Complex sentence: Doctor Whooves is a brown-coated earth stallion with brown hair and an hourglass for a cutie mark; his first appearance was in "Call of the Cutie" as a minor character.
Split into simpler sentences: Doctor Whooves is a brown-coated earth stallion with brown hair and an hourglass for a cutie mark. His first appearance was in "Call of the Cutie" as a minor character.