Complex sentence: Pimple, Rash and Zitz, also known as the Battletoads are the titular player characters in the "Battletoads" video game series, first introduced in "Battletoads" in 1991.
Split into simpler sentences: Pimple, Rash and Zitz, also known as the Battletoads are the titular main characters in the "Battletoads" video game series. They were first introduced in "Battletoads" in 1991.