Complex sentence: The Ealing Jazz Club opened in January 1959 in the basement of 42A Ealing Broadway, Ealing; initially as "a backstairs session at the moist hoist".
Split into simpler sentences: The Ealing Jazz Club was opened in January 1959 in the basement of 42A Ealing Broadway Ealing. London, England initially as "a backstairs session at the moist hoist".