Sal Sinatra, president and chief operating officer of Equibase, resigned Friday, according to a release of the Equibase Corporation. "I am stepping aside at this point so that I may dedicate my time to personal issues that require my full attention," said Sinatra. "I am grateful to the members of the Equibase Management Committee for their support of me and to my co-workers at Equibase Company and The Jockey Club for their help and kind assistance since I joined Equibase one year ago." Ian Highet, chairman of Equibase, said that...