Complex sentence: The group formed in 1999 and went on to release 11 singles, 4 studio albums and 1 compilation album throughout there career, in 2003 the group announced they would be splitting.
Split into simpler sentences: The group formed in 1999 and went on to release 11 singles, 4 studio albums and 1 compilation album throughout their career. In 2003, the group announced they would be splitting.