Complex sentence: Chancellor George L. Simpson appointed Boyd as Acting President of Georgia Tech, a post he held from May 1971 to March 1972, when he was succeeded in the position by Joseph M. Pettit.
Split into simpler sentences: Chancellor George L. Simpson appointed Boyd as Acting President of Georgia Tech, a post he held from May 1971 to March 1972. Boyd held the position until a president was found in March 1972; he was succeeded in the position by Joseph M. Pettit.