Complex sentence: In "Salty's Lighthouse", Nantucket's name was changed to Tramper, and not only did he become a friendly character, but sometimes he couldn't even speak (in which a foghorn sound effect was used instead).
Split into simpler sentences: In "Salty's Lighthouse", Nantucket's name was changed to Tramper. Not only did he also become a friendly character, but sometimes he couldn't even speak (in which a foghorn sound effect was used instead).