Complex sentence: After the war the company had a major role in the construction of modern submarines, the first nuclear submarine SSN-571 was launched in 1954 and the first ballistic-missile submarine, USS George Washington in 1959, amongst others.
Split into simpler sentences: After the war the company had a major role in the construction of modern submarines. The first nuclear submarine SSN-571 was launched in 1954 and the first ballistic-missile submarine, USS George Washington in 1959, amongst others.