Complex sentence: Looptroop was formed in 1992 by Promoe and Embee, whom had met while attending school in Västerås and were still in their teens at the time of the group's inception.
Split into simpler sentences: Looptroop was formed in 1992 by Promoe and Embee. The two had met while attending school in Västerås and were still in their teens at the time of the group's inception.