Complex sentence: Bangalter and de Homem-Christo were originally in an indie rock band named Darlin' which disbanded after a short period of time, leaving the two to experiment musically with drum machines and synthesisers.
Split into simpler sentences: Bangalter and de Homem-Christo were originally briefly in an indie rock band named Darlin'. When the group disbanded, it left the two to experiment musically with drum machines and synthesisers.