Complex sentence: On the morning of October 1,2003, Brim talked on the phone with his friend, then fell ill. Brim was rushed to the hospital, then was pronounced dead.
Split into simpler sentences: On the morning of October 1,2003, Brim talked on the phone with his friend. After he hung the phone up, Brim then fell ill. Brim was rushed to the hospital, then was pronounced dead.