Complex sentence: From 1960 to 1965, Spector produced more than twenty-five Top 40 singles for various artists, but following sporadic work in the 1970s, he remained largely inactive.
Split into simpler sentences: From 1960 to 1965, Spector produced more than twenty-five Top 40 singles for various artists. Following sporadic work in the 1970s, Spector remained largely inactive.