Complex sentence: In the 1990s and 2000s, Marilyn Manson became perhaps the most notable and well known act in shock rock, being dubbed by the media as one of the most controversial and shocking musicians in music history.
Split into simpler sentences: In the 1990s and 2000s, Marilyn Manson became perhaps the most notable and well known act in shock rock. He was dubbed by the media as one of the most controversial and shocking musicians in music history.