Complex sentence: The Ruffin/Kendrick/Edwards project was cut short in 1991, when Kendrick was diagnosed with lung cancer and David Ruffin died of a drug overdose, although Kendrick and Edwards continued to tour for the remainder of 1991.
Split into simpler sentences: The Ruffin/Kendrick/Edwards project was cut short in 1991, when Kendrick was diagnosed with lung cancer and David Ruffin died of a drug overdose. Although, Kendrick and Edwards continued to tour for the remainder of 1991.