Complex sentence: L.A. Reid replaced Jones with Rozonda "Chilli" Thomas and the group was signed in 1991 as TLC, which would go on to become one of the most successful girl groups in history and sell over 45 million records worldwide.
Split into simpler sentences: L.A. Reid replaced Jones with Rozonda "Chilli" Thomas and the group was signed in 1991 as TLC. They went on to become one of the most successful girl groups in history and sell over 45 million records worldwide.