Complex sentence: CPR president William Cornelius Van Horne had personally chosen the site in the Rocky Mountains for the new hotel, and he envisioned a string of grand hotels across Canada that would draw visitors from abroad to his railway.
Split into simpler sentences: CPR president William Cornelius Van Horne had personally chosen the site in the Rocky Mountains for the new hotel. He envisioned a string of grand hotels across Canada that would draw visitors from abroad to his railway.