Complex sentence: His studies were interrupted by the outbreak of World War II. He served with the in the Fourteenth Army in India and fought in the Battle of Imphal which stemmed the Japanese invasion of India in 1944.
Split into simpler sentences: His studies were interrupted by the outbreak of World War II, and he eventually served with the in the Fourteenth Army in India. He fought in the Battle of Imphal which stemmed the Japanese invasion of India in 1944.