Complex sentence: To the east of the house was a formal garden laid out on a one-acre plot by Philadelphia-based English gardener, William Frost in 1819, in a typical four-square English garden style consisting of four quadrants and circular center beds.
Split into simpler sentences: To the east of the house was a one-acre formal garden laid out by Philadelphia-based English gardener, William Frost in 1819. The garden is in the English four-square style consisting of four quadrants and circular center beds.