Complex sentence: Superman tries to stop Intergang and comes into contact with Red kyrptonite, which affects Superman in that he doesn't care about standing up for justice like he is portrayed in the series and lets Intergang get away with their crimes.
Split into simpler sentences: Superman tries to stop Intergang and comes into contact with Red kyrptonite. Red kryptonite affects Superman in that he doesn't care about standing up for justice like he is portrayed in the series and lets Intergang get away with their crimes.