Complex sentence: He was awarded the Military Cross for his gallantry at Ushun in the Crimea on 8 and 10 March 1920, where he attached himself to the Police Regiment and remained with them throughout the two days' counter-attacks, during which they sustained heavy casualties.
Split into simpler sentences: He was awarded the Military Cross for his gallantry at Ushun in the Crimea on 8 and 10 March 1920. According to the citation he attached himself to the Police Regiment and remained with them throughout the two days' counter-attacks, during which they sustained heavy casualties.