Complex sentence: Tensions between Ozzy/Sharon and Bob/Lee over contract issues over their names, money, credit, and royalties were getting worse, which then led to Sharon firing both Bob and Lee in March 1981.
Split into simpler sentences: Tensions between Ozzy/Sharon and Bob/Lee over contract issues over their names, money, credit, and royalties were getting worse. This led to Sharon firing both Bob and Lee in March 1981.