Complex sentence: As A Touch of Class, the men impressed DeVante by performing a cappella versions of Jodeci songs backstage after a concert in 1991/1992.
Split into simpler sentences: As A Touch of Class, the men met DeVante from Jodeci backstage at a concert. Essentially they impressed DeVante by performing a cappella versions of Jodeci songs backstage after a concert in 1991/1992.