Complex sentence: He would also warn him later in the Series that if he went to Z'ha'dum, he would die and later told Sheridan that when he went to Z'ha'dum, he would not be there to help.
Split into simpler sentences: He would also warn him later in the Series that if he went to Z'ha'dum, he would die. He also told Sheridan that when he went to Z'ha'dum, he would not be there to help.