Complex sentence: They allowed upper-and upper-middle-class men with modest incomes to spend their time in grand surroundings; the richer clubs were built by the same architects as the finest country houses of the time, and had the same types of interiors.
Split into simpler sentences: They allowed upper-and upper-middle-class men with modest incomes to spend their time in grand surroundings. The richer clubs were built by the same architects as the finest country houses of the time, and had similar types of interiors.