Complex sentence: The band released one album, "Sarcelles-Lochères", in 1970, before breaking up--given the times, rather appropriately into a socialist and a Trotskyist section, the latter of which continued under the name Komintern.
Split into simpler sentences: The band released one album, "Sarcelles-Lochères", in 1970, before breaking up. Given the revolutionary times, the band split rather appropriately into a socialist and a Trotskyist section, the latter of which continued under the name Komintern.