Complex sentence: The bridge, which is long, was created with the construction/reconstruction of the Portage Glacier Highway, and allows the highway to cross over the small Portage Creek, which is fed by the Portage Glacier and Portage Lake.
Split into simpler sentences: The bridge, which is long, was created with the construction/reconstruction of the Portage Glacier Highway. It allows the highway to cross over the small Portage Creek, which is fed by the Portage Glacier and Portage Lake.