Complex sentence: Sztywny Pal Azji returned in the summer of 2007, and recorded a new album with new lead singer Bartosz Szymoniak.
Split into simpler sentences: Sztywny Pal Azji returned in the summer of 2007. In 2007 Sztywny Pal Azji started to record new album with new singer-Bartosz Szymoniak.