Complex sentence: He worked under David Ifft as crew chief for Darrell Waltrip, and in May of 1977, following victory at the Winston 500 Ifft left the team and Parrott was promoted to full-time crew chief.
Split into simpler sentences: He worked under David Ifft as crew chief for Darrell Waltrip. In May 1977, following victory at the Winston 500, Ifft left the team and Parrott was promoted to full-time crew chief.