Original sentence: According to the terms of the treaty, Henry was married to Catherine, daughter of Charles VI; upon Charles' death, the crown would pass to their issue, uniting the two kingdoms.Although Charles VI had left an heir, the dauphin Charles, the crown of France had instead passed to the infant King Henry VI of England.This essentially removed the Dauphin from the line of succession, but was opposed by many French nobles.This was the result of the the Treaty of Troyes signed by the Charles VI and England's Henry V in 1420 in an attempt to end the Hundred Years' War and a repetition of the trememdous loss of life that had occurred at Agincourt
Edited sentence: His son, dauphin Charles, could not be crowned because of the Treaty of Troyes signed by the deranged Charles VI in 1420 that denied his son Charles the throne and granted it to King Henry VI of England