Complex sentence: Alpher was a 2005 recipient of the National Medal of Science, the highest such honor in the United States, which was presented to his son Dr. Victor S. Alpher on July 27,2007 during which time he could not travel to receive the award.
Split into simpler sentences: Alpher was a 2005 recipient of the National Medal of Science, the highest such honor in the United States. The medal was presented to his son Dr. Victor S. Alpher on July 27,2007 as his father could not travel to receive the award.