Complex sentence: Sheridan subsequently joined the Customs Department in Sydney in February 1846 but his illness made him be eventually transferred to Moreton Bay (Brisbane) in February 1853, where on 31 May, he became a member of the Steam Navigation Board.
Split into simpler sentences: Sheridan subsequently joined the Customs Department in Sydney in February 1846. Yet because of illness he was eventually transferred to Moreton Bay (Brisbane) in February 1853, where on 31 May he became a member of the Steam Navigation Board.