Complex sentence: The first prototype was later used by Napier & Son at Luton for trials of the firm's in-flight de-icing systems, until it was briefly used for ground-training purposes beginning on 30 April 1952, until scrapped shortly afterwards.
Split into simpler sentences: The first prototype was later used by Napier & Son at Luton for trials of the firm's in-flight de-icing systems. It was then briefly used for ground-training purposes beginning on 30 April 1952, until scrapped shortly afterwards.