Complex sentence: STV12 produced the world's first Tamil sitcom, Amali Thumali, which premiered on Prime 12 in 1997, and introduced the nation's first locally-produced animation series, Jo Kilat in 1998.
Split into simpler sentences: STV12 produced the world's first Tamil sitcom, Amali Thumali, which premiered on Prime 12 in 1997. It then introduced the nation's first locally-produced animation series, Jo Kilat, on Prime 12 in 1998.