Complex sentence: In February 1969, Mark became director of NASA's Ames Research Center, Mountain View, California, where he managed the center's research and applications efforts in aeronautics, space science, life science and space technology.
Split into simpler sentences: In February 1969, Mark became director of NASA's Ames Research Center, Mountain View, California, in 1969. In this role, he managed the center's research and applications efforts in aeronautics, space science, life science and space technology.