Complex sentence: It consisted of two batteries the 217 and 220 (Wiltshire) they remained in the United Kingdom until Juine 1944 when they were deployed to France, with the 43rd (Wessex) Infantry Division.
Split into simpler sentences: It consisted of two batteries, the 217 and 220 (Wiltshire). It remained in the United Kingdom until June 1944 when it was deployed to France, with the 43rd (Wessex) Infantry Division.