Complex sentence: A team of four engineers in the motorcar group of the Technical Bureau participated in the development, including a young army officer, Major Tomio Hara who later became the head of the tank development department and would rise to the rank of General.
Split into simpler sentences: A team of four engineers in the motorcar group of the Technical Bureau participated in the development, including a young army officer, Major Tomio Hara. Major Hara later became the head of the tank development department and would rise to the rank of General.