Complex sentence: In 1890, the "Tredegar Workmen's Medical Aid and Sick Relief Fund" was formed by a merger of a large number of local benevolent societies in Tredegar, including one society which provided medical benefits and funeral expenses to its 3,000 members.
Split into simpler sentences: In 1890, a merger of various local societies in Tredegar allowed the "Tredegar Workmen's Medical Aid and Sick Relief Fund" to be formed. This merger included a large number benevolent societies including one society which provided medical benefits and funeral expenses to its 3,000 members.