Complex sentence: A team of engineers participated in the development of the medium main battle tank, 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 engineers participated in the development of the medium main battle tank, including a young army officer, Major Tomio Hara. Hara later went on to become the head of the tank development department and rose to the rank of General.