Complex sentence: Goodbye to Gravity was a Romanian metalcore band from Bucharest, active from 2010, until 2015, when four of five members were killed in a nightclub fire started by the band's pyrotechnics.
Split into simpler sentences: Goodbye to Gravity was a Romanian metalcore band from Bucharest, formed in 2010. Four of five members were killed in a nightclub fire started by the band's pyrotechnics.