Complex sentence: Lang still faced significant opposition within the caucus and the caucus appointed cabinet but he was able to defeat his opponents by returning his commission as Premier to the Governor, Sir Dudley de Chair on 25 May 1927.
Split into simpler sentences: Lang still faced significant opposition within the caucus and the caucus appointed cabinet. He defeated his opponents by returning his commission as Premier to the Governor, Sir Dudley de Chair on 25 May 1927.