Complex sentence: Gottlieb graduated from Columbia University in 1952, and spent two years at Cambridge University before joining Simon & Schuster in 1955 as an editorial assistant to Jack Goodman, the editor-in-chief.
Split into simpler sentences: Gottlieb graduated from Columbia University in 1952, and spent two years at Cambridge University. Gottlieb joined Simon & Schuster in 1955 as an editorial assistant to Jack Goodman, the editor-in-chief.