Complex sentence: Due to changing public tastes and personal problems, Dion faltered in the mid- 1960s; he regained popularity later in the decade and into the early 1970s with more mature, contemplative material such as "Abraham, Martin & John".
Split into simpler sentences: Due to changing public tastes and personal problems, Dion faltered in the mid- 1960s. He regained popularity later in the decade and into the early 1970s with more mature, contemplative material such as "Abraham, Martin & John".