Complex sentence: Lombardo's music career has spanned more than 30 years, during which he has been involved in the production of 35 commercial recordings extending over a number of genres with bands such as Grip Inc., Fantômas, Testament, Suicidal Tendencies, in addition to Slayer.
Split into simpler sentences: Lombardo's music career spanned more than thirty years, during which he has been involved in the production of thirty-five commercial recordings covering a number of genres. He has performed with numerous bands, including Grip Inc., Fantômas, Testament, Suicidal Tendencies, in addition to Slayer.