Complex sentence: Kai Hahto (born in 1973 in Vaasa, Finland) is a Finnish drum-teacher and the drummer of the Finnish metal band Wintersun, and the former drummer of grindcore band Rotten Sound.
Split into simpler sentences: Kai Hahto (born in 1973 in Vaasa, Finland) is a Finnish musician and drummer. Hahto is a member of the Finnish metal band Wintersun and the former drummer of the grindcore band Rotten Sound.