Complex sentence: By the late 1990s, Jive began signing pop acts Backstreet Boys,'N Sync, and Britney Spears; all three achieved massive success as the 2000s dawned, and would become the three best-selling acts in the label's history.
Split into simpler sentences: By the late 1990s, Jive began signing pop acts Backstreet Boys,'N Sync, and Britney Spears. All three achieved massive success as the 2000s dawned, and would become the three best-selling acts in the label's history.