Complex sentence: To keep the WWF from having a pay-per-view market monopoly, Turner began airing monthly WCW pay-per-views, and both companies began bringing in hundreds of millions of dollars of revenue.
Split into simpler sentences: To keep the WWF from having a pay-per-view market monopoly, Turner began airing monthly WCW pay-per-views. As a result, both companies began bringing in hundreds of millions of dollars of revenue.