Complex sentence: When John I died in 1433, Henry's eldest brother, Edward became king, and granted Henry all profits from trading within the areas he discovered as well as the sole right to authorize expeditions beyond Cape Bojador.
Split into simpler sentences: When John I died in 1433, Henry's eldest brother Edward became king. He granted Henry all profits from trading within the areas he discovered as well as the sole right to authorize expeditions beyond Cape Bojador.