Complex sentence: Bassist Sami Vänskä left the band after the recording of this CD, due to musical differences between him and Tuomas Holopainen, to be replaced by the current bassist and male vocalist, Marco Hietala.
Split into simpler sentences: Bassist Sami Vänskä left the band after its recording, due to musical differences between him and Tuomas Holopainen. He was replaced by the current bassist and male vocalist, Marco Hietala.