Complex sentence: Owing to shyness and weak health Gellert gave up all idea of entering the ministry, and, establishing himself in 1745 as "Privatdozent" in philosophy at the university of Leipzig, lectured on poetry, rhetoric and literary style with much success.
Split into simpler sentences: Owing to shyness and weak health Gellert gave up the idea of entering the ministry. In 1745 he established himself in 1745 as "Privatdozent" in philosophy at the university of Leipzig, lecturing on poetry, rhetoric and literary style with much success.