Complex sentence: It became known for high-class shopping in the 18th century, and gentlemen's clubs in the 19th, when the Reform, Athenaeum and Travellers Clubs opened and which have survived to the 21st century.
Split into simpler sentences: It became known for high-class shopping in the 18th century, and gentlemen's clubs in the 19th. The Reform, Athenaeum and Travellers Clubs have all survived to the 21st century.