Complex sentence: The 142d was upgraded to the F-94B Starfire on 1 October 1951 and the Air National Guard unit was returned to State of Deleware control on 1 November 1952.
Split into simpler sentences: The 142d was upgraded to the F-94B Starfire on 1 October 1951. The National Guard unit was returned to state Control 1 November 1952.