Complex sentence: With the main World Trade Center site, numerous stakeholders were involved including Silverstein and the Port Authority, which in turn meant that George Pataki, the then-Governor of New York, had some authority.
Split into simpler sentences: With the main World Trade Center site, numerous stakeholders were involved, including Silverstein and the Port Authority. The latter's involvement meant that George Pataki, the then-Governor of New York, had some authority.