Complex sentence: The original reason for this long dispute is unknown, however we do know of some of the affairs that kept the feud alive and becoming ever more intense: one of the main factors was jealousy about nearly everything: titles, wealth, women and land.
Split into simpler sentences: The original reason for this long dispute is unknown, however we do know of some of the affairs that kept the feud alive and becoming ever more intense. One of the main factors was jealousy about nearly everything: titles, wealth, women and land.