Complex sentence: The company has been brewing beer since August 17,1988, but the history of Sleeman beer goes back to 1834 when John H. Sleeman established himself as a brewer and malter.
Split into simpler sentences: The company has been brewing beer since August 17,1988. But the history of Sleeman beer goes back to 1834 when John H. Sleeman established himself as a brewer and malter.