Complex sentence: He was put into a play in 8th grade that he said "changed everything", as far as going from an indoorsy kid who was bullied, to becoming the funny, popular kid in high school, even being voted Valedictorian.
Split into simpler sentences: He was put into a play in grade eight that he said "changed everything" for him. He went from an indoorsy kid who was bullied, to becoming the funny, popular kid in high school, even being voted Valedictorian.