Complex sentence: Tezuka also had a habit of introducing nonsensical characters at random moments in order to lighten a scene which is becoming too serious; he sometimes felt trapped by the need to satisfy the young male audience's desire to see battling robots.
Split into simpler sentences: Tezuka also had a habit of introducing nonsensical characters at random moments in order to lighten a scene which is becoming too serious. He sometimes felt trapped by the need to satisfy the young male audience's desire to see battling robots.