Original sentence: The Titan I was the first version of the Titan family of rockets
Edited sentence: In the early 1960’s the rocket was adapted to launch the Gemini capsule that carried two people at a time into space.It was the United States’ first two stage rocket and formed an integral part of their strategic deterrent force.The Titan I was the first version of the Titan family of rockets, first developed in October 1955, when the US Air Force awarded the then Martin Company a contract to build an Intercontinental Ballistic Missile (ICBM).Titan succeed in launching 12 Gemini spacecraft and has also helped to launch the Viking missions to Mars, Voyager I and II and most recently Cassini to Saturn