Complex sentence: In September 1940 it became home to the first RAF "Eagle squadron" of American volunteers (71), the first all-Canadian RAF Squadron (242), and the first all-Polish RAF Squadron (306).
Split into simpler sentences: In September 1940 it became home to the first RAF "Eagle squadron" of American volunteers (71). It also hosted the first all-Canadian RAF Squadron (242) and the first all-Polish RAF Squadron (306).