Complex sentence: His first appearance was in the episode Simpson and Delilah on one of the security screens smoking, which shows he's a smoker and as well as smoking, he is occasionally seen in Moe's Tavern drinking so he is also a drinker.
Split into simpler sentences: His first appearance was in the episode Simpson and Delilah on one of the security screens smoking, which shows he's a smoker. As well as smoking, he is occasionally seen in Moe's Tavern drinking so he is also a drinker.