Complex sentence: The two had left their previous band due to differences regarding the music style, and soon welcomed Zino van Leerdam to the band as their keyboardist, Luna van der Reijken as singer, and Wessel van Delft as bassist.
Split into simpler sentences: The two had left their previous band due to differences regarding the music style. They soon welcomed Zino van Leerdam to the band as their keyboardist, Luna van der Reijken as singer, and Wessel van Delft as bassist.