Complex sentence: He co-wrote the episodes "Dragonchasers" and "Two Days of Blood" with fellow staff writer Scott Rosenbaum and was promoted to story editor for the second season in 2003.
Split into simpler sentences: He co-wrote the episodes "Dragonchasers" and "Two Days of Blood" with fellow staff writer Scott Rosenbaum. He was promoted to story editor for the second season in 2003.