Complex sentence: While Nitro and Mercury held the championship Melina was placed in an angle with Heidenreich, publicly mocking him and being the impetus for an attack on him by Nitro and Mercury.
Split into simpler sentences: While Nitro and Mercury held the championship, Melina was placed in an angle with Heidenreich. She publicly mocked him and being the impetus for an attack on him by Nitro and Mercury.