Complex sentence: Prince Alfred College launched its own kindergarten "Little Princes" in 1999, which was renamed Princes ELC in 2009, and claims to have the largest "Old Scholars" organisation (by membership) in the southern hemisphere.
Split into simpler sentences: Prince Alfred College launched its own kindergarten, "Little Princes", in 1999, which was renamed Princes ELC in 2009. The college claims to have the largest "Old Scholars" organisation (by membership) in the southern hemisphere.