Complex sentence: Kathryn Dwyer Sullivan, Ph.D. (born October 3,1951 in Paterson, New Jersey) became the first American woman to walk in space when she performed an EVA during Space Shuttle Challenger mission STS-41-G on 1984 October 11.
Split into simpler sentences: Kathryn Dwyer Sullivan, Ph.D. (born October 3,1951 in Paterson, New Jersey) became the first American woman to walk in space. Sullivan performed an EVA during Space Shuttle Challenger mission STS-41-G on 1984 October 11.