Complex sentence: Steiger was attracted to attend a drama class primarily because it was attended by mainly pretty young girls, known as the Civil Service Little Theater group, conducted by the Office of Dependants and Beneficiaries were he was employed at the time.
Split into simpler sentences: Steiger was attracted to attend a drama class primarily because it was attended by mainly pretty young girls. Known as the Civil Service Little Theater group, it was conducted by the Office of Dependants and Beneficiaries, where he was employed at the time.