Complex sentence: Golos established a company called World Tourists with money from Earl Browder, General Secretary of the CPUSA, which posed as a travel agency was used to facilitate international travel to and from the United States by Soviet agents and CPUSA members.
Split into simpler sentences: Golos established a company called World Tourists with money from Earl Browder, General Secretary of the CPUSA. The firm, which posed as a travel agency, was used to facilitate international travel to and from the United States by Soviet agents and CPUSA members.