Complex sentence: However, writing scripts was what he was most interested in and his second effort about the North-West Mounted Police, "In Wyoming", was a commercial success, and was later the basis for his film "Nanette of the Wilds".
Split into simpler sentences: However, writing scripts was what he was most interested in and his second effort about the North-West Mounted Police titled "In Wyoming" proved to be a commercial success. It would later be used as a basis for the screenplay for his film "Nanette of the Wilds".