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