Complex sentence: Promoting "A Fistful of Dollars" was difficult given that no major distributor wanted to take chance on a faux-Western and an unknown director and the film ended up being released in September which is typically the worst month for sales.
Split into simpler sentences: Promoting "A Fistful of Dollars" was difficult, because no major distributor wanted to take a chance on a faux-Western and an unknown director. The film ended up being released in September, which is typically the worst month for sales.