Complex sentence: TRL didn't have the same impact as the U.S.A's version as the U.S.A. 's version kick started the careers of Backstreet Boys, N'Sync and Christina Aguilera.
Split into simpler sentences: TRL didn't have the same impact as the U.S.A's version did. The U.S.A. 's version kick started the careers of Backstreet Boys, N'Sync and Christina Aguilera.