Complex sentence: He brought that story to an abrupt end in 1989 when, excited by the autobiographical comics of Joe Matt and Julie Doucet, he turned towards revealing personal stories, and the uncomplicated artwork of his friend and fellow Toronto cartoonist Seth inspired him to simplify his own.
Split into simpler sentences: He brought that story to an abrupt end in 1989 when, excited by the autobiographical comics of Joe Matt and Julie Doucet, he turned towards personal stories. The uncomplicated artwork of his friend and fellow Toronto cartoonist Seth inspired him to simplify his own.