Complex sentence: He worked on the Mars Pathfinder mission from 1992--1997, and in February 2010 was named by NASA Administrator Charles F. Bolden, Jr., as the Agency's Chief Technologist.
Split into simpler sentences: He worked on the Mars Pathfinder mission from 1992--1997. In February 2010, Braun was named by NASA Administrator Charles F. Bolden, Jr. as the Agency's Chief Technologist.