Complex sentence: A major proponent of the airport's 2004--2006 expansion projects was Peter J. McGowan, then the Islip Town Supervisor; the new concourse was named after McGowan.
Split into simpler sentences: A major proponent of the airport's 2004--2006 expansion projects was Peter J. McGowan, then the Islip Town Supervisor. When completed, the new concourse was named after McGowan.