Complex sentence: Yonge Street had to be diverted for several years in order to accommodate the expansion of Sheppard Station; since the completion of the line, the temporary diversion of Yonge are two vacant lots.
Split into simpler sentences: Yonge Street had to be diverted for several years in order to accommodate the expansion of Sheppard Station. Since the completion of the line, the temporary diversion of Yonge are two vacant lots.