Complex sentence: The Danegeld was succeeded by the carucage, and the commutation of military service introduced the scutage, but these forms were of little immediate importance, though very significant for the future course of development.
Split into simpler sentences: The Danegeld was succeeded by the carucage, and the commutation of military service introduced the scutage. However, these forms were of little immediate importance albeit becoming very significant for the future course of development.