Complex sentence: He graduated from the Complutense University of Madrid in 1988 and moved to the United States in 1991 to work as a postdoctoral scientist in the Joint Institute for Laboratory Astrophysics in University of Colorado at Boulder.
Split into simpler sentences: He graduated from the Complutense University of Madrid in 1988. He moved to the United States in 1991 to work as a postdoctoral scientist in the Joint Institute for Laboratory Astrophysics in University of Colorado at Boulder.