Complex sentence: During the mid 1950's the library contained 35,000 volumes and 5,000 pamphlets thus, the Woman's Club working together with the city of Coral Gables steered the library to be operated by the city because it was becoming too big of a responsibility for the club.
Split into simpler sentences: During the mid 1950's the library contained 35,000 volumes and 5,000 pamphlets. Thus, the Woman's Club, working together with the city of Coral Gables, steered the library to be operated by the city because it was becoming too big of a responsibility for the club.