Complex sentence: Microsoft also purchased a large amount of advertising on Viacom owned broadcasts and online networks, and collaborated on promotions and sponsorships for MTV and BET award shows, two Viacom owned cable networks.
Split into simpler sentences: Microsoft also purchased a large amount of advertising on Viacom owned broadcasts and online networks. Finally, Microsoft will also collaborate on promotions and sponsorships for MTV and BET award shows, two Viacom owned cable networks.