Complex sentence: Through various lineup changes the band experimented and consistently fronted up as an energetic and formidable live performance unit until the end of 1987, when after much touring and having all their gear stolen, the Guerillas had imploded.
Split into simpler sentences: Through various lineup changes the band experimented and consistently fronted up as an energetic and formidable live performance unit. Success brings demands and by the end 1987 after much touring and having all their gear stolen, the Guerillas had imploded.