Complex sentence: Frank Craighill was one of the founding partners of the sports marketing firm Pro Serv. Pro Serv was created in 1970 in Washington, D.C. by attorney and former professional tennis player and U.S. Davis Cup captain Donald Dell and Craighill.
Split into simpler sentences: Frank Craighill was one of the founding partners of the sports marketing firm ProServLink title. ProServ was created in 1970 in Washington, D.C. by attorney and former professional tennis player and U.S. Davis Cup captain Donald Dell and Craighill.