Complex sentence: This success won Dion and the Belmonts their first major tour in late 1958, with The Coasters, Buddy Holly and Bobby Darin, and this was followed by the "Winter Dance Party" tour with Holly, Ritchie Valens and The Big Bopper.
Split into simpler sentences: This success won Dion and the Belmonts their first major tour in late 1958, with The Coasters, Buddy Holly and Bobby Darin. This was followed by the "Winter Dance Party" tour with Holly, Ritchie Valens and The Big Bopper.