Complex sentence: His project, that would come to include several hotels, began with the construction of wharves on the river to accommodate steamboats that attracted a steamship agency that could bring in the necessary materials and supplies.
Split into simpler sentences: His project, which would come to include several hotels, began with the construction of wharves on the river to accommodate steamboats. These steamboats attracted a steamship agency that could bring in the necessary materials and supplies.