Complex sentence: Armand Keosian provided Nazarian a office with a view of a golf course in his Century City, Los Angeles Suite on the Avenue of the Stars which was critical to Nazarian's success in the early days of his practice.
Split into simpler sentences: Armand Keosian provided Nazarian with an office with a view of a golf course in his Century City, Los Angeles Suite on the Avenue of the Stars. This was critical to Nazarian's success in the early days of his practice.