Complex sentence: In the end of 1999 the vocalist Svetoslav Vitkov went to work in the USA, but despite that the other band members decided to start recording new material, inviting several singers from other Bulgarian bands, who replaced Vitkov on the vocals.
Split into simpler sentences: In the end of 1999, the vocalist Svetoslav Vitkov went to work in the USA. Despite the loss of Vitkov, the other band members decided to start recording new material, inviting several singers from other Bulgarian bands, who replaced Vitkov on the vocals.