Complex sentence: Ruffin's most notable non-vocal contribution to the Temptations was the masterminding of their trademark four-headed microphone stand., thus enabling the other members to sing and do their dances without having to all crowd around microphone while the lead singer would sing into a separate microphone.
Split into simpler sentences: Ruffin's most notable non-vocal contribution to the Temptations was the masterminding of their trademark four-headed microphone stand. This enabled the other members to sing and do their dances without having to crowd around one microphone while the lead singer would sing into a separate microphone.