Complex sentence: It was located on a corner originally known as "Pie Corner" (today the corner of Giltspur Street and Cock Lane) whose name derived from the magpie represented on the sign of an adjoining tavern.
Split into simpler sentences: It was located on a corner originally known as "Pie Corner", today the corner of Giltspur Street and Cock Lane. Its name derived from the magpie represented on the sign of an adjoining tavern.