Complex sentence: Bruce Banner rushes out to save Rick from the Gamma Bomb blast which turns Bruce into the Hulk after which Rick befriends Bruce and does his best to try and help him in his adventures and keep his secret.
Split into simpler sentences: Bruce Banner rushes out to save Rick from the Gamma Bomb blast which turns Bruce into the Hulk. Afterwards, Rick befriends Bruce and does his best to try and help him in his adventures and keep his secret.