Complex sentence: By 1993, disappointed over the collapse of Enigma, the JRS fiasco and the general decline in popularity of classic rock music, the band went into semi-retirement, resurfacing each year to play occasional concerts, with Verlin back on bass.
Split into simpler sentences: By 1993, disappointed over the collapse of Enigma, the JRS fiasco, and the general decline in popularity of classic rock music, the band went into semi-retirement. They resurfaced each year to play occasional concerts, with Verlin back on bass.