Complex sentence: In 1971, House of Fraser purchased another department store group, Dingles group, and JJ Allen's west country stores were transferred to the Dingles division with the rest being transferred to the Harrods division.
Split into simpler sentences: In 1971, House of Fraser purchased another department store group Dingles group. After this purchase, JJ Allen's west country stores were transferred to the Dingles division with the rest being transferred to the Harrods division.