Complex sentence: The Fremantle's first flight was on 28 November 1924 with Norman Macmillan at the controls and he flew it throughout its flying programme, which lasted until the following June.
Split into simpler sentences: The Fremantle's first flight was on 28 November 1924, with Norman Macmillan at the controls. Macmillan flew it throughout its flying programme, which lasted until the following June.