Complex sentence: Though both David and his brother Jimmy were considered, David was given an edge over Jimmy thanks to his performance skills, which David displayed when he joined the Temptations on-stage during the New Year's Eve party in 1963.
Split into simpler sentences: Though both David and Jimmy were considered, David was given the edge, thanks to his performance skills. These were displayed when he joined the Temptations on stage during the label's New Year's Eve party in 1963.