Complex sentence: By 1884, Schmidt was a partner at the North Star Brewery not far from Hamm's brewery and by 1899 had established his own brewery on the site of the former Stalhmann Brewery site.
Split into simpler sentences: By 1884, Schmidt was a partner at the North Star Brewery not far from Hamm's brewery. By 1899 he had established his own brewery on the site of the former Stalhmann Brewery site.