Complex sentence: After Mr Ellis retirement the Ambrose had many proprietors/landlords until 1933 when Cases Brewery bought the Ambrose to be part of its tied easte, it remained with Cases (Cases Brewery was sold to Bass Brewery in the 1960s).
Split into simpler sentences: After Mr Ellis' retirement the Ambrose had many proprietors/landlords until 1933 when Cases Brewery bought the Ambrose to be part of its tied estate. It remained with Cases (Cases Brewery was sold to Bass Brewery in the 1960s).