Complex sentence: At the end of 1952, he was promoted to Commander of the 2e Groupe Mobile then of the 3e GM. While commanding the 3rd Groupe Mobile, Đồng participated in some of the hardest-fought operations to pacify the Red River Delta, especially in Ninh Bình.
Split into simpler sentences: At the end of 1952, he was promoted to Commander of the 2e Groupe Mobile. During this period, he participated in some of the hardest-fought operations to pacify the Red River Delta, especially in Ninh Bình.