Complex sentence: Barbara Radding "Barb" Morgan (born November 28,1951) is an American teacher and a retired NASA astronaut who participated in the Teacher in Space program as the backup to Christa McAuliffe for the ill-fated STS-51L mission of Space Shuttle Challenger.
Split into simpler sentences: Barbara Radding "Barb" Morgan (born November 28,1951) is an American teacher and a NASA astronaut. She also participated in the Teacher in Space program as the backup to Christa McAuliffe for the ill-fated STS-51L mission of Space Shuttle Challenger.