Complex sentence: Araki left Miyagi University of Education before graduating, and made his debut in 1980 with the wild west one-shot "Poker Under Arms", which was a "Selected Work" at that year's Tezuka Award.
Split into simpler sentences: Araki left Miyagi University of Education before graduating, and made his debut in 1980 with the wild west one-shot "Poker Under Arms". Which was a "Selected Work" at that year's Tezuka Award.