Complex sentence: By the start of the twentieth century, A. Hamburger & Sons was outgrowing their Spring Street location and they decided to build a much larger new store at Broadway and Eighth, a location that was much farther south of then current retail district.
Split into simpler sentences: By the start of the twentieth century, A. Hamburger & Sons had even outgrown their Spring Street location. The Hamburger family decided to build a much larger store at Broadway and Eighth, a location that was much farther south of then current retail district.