Complex sentence: Gaining an interest in darker animation, he began directing "The Running Man" after which he was instructed to make a 35 minute short based on Hideyuki Kikuchi's novels, which was released as "Wicked City".
Split into simpler sentences: Gaining an interest in darker animation, he next directed "The Running Man". Afterwards, he was instructed to make a 35 minute short based on Hideyuki Kikuchi's novels, which was released as "Wicked City".