Complex sentence: Investor Larry Silverstein said the Port Authority's estimated completion date for the entire site was 2037, and billions of dollars had already been spent on the project, even though Ground Zero "is still a hole in the ground".
Split into simpler sentences: Investor Larry Silverstein said the Port Authority's estimated completion date for the entire site was 2037. Although billions of dollars had already been spent on the project, he said Ground Zero "is still a hole in the ground".