Complex sentence: A free peasant paid for field work around the same period could expect around 3d per day, or a much as £3-4 in a year, meaning that a knight's fee was about three to five times more than a peasant's average income.
Split into simpler sentences: A free peasant paid for field work around the same period could expect around 3d per day, or a much as £3-4 in a year. A knight's fee was only about three to five times as much as a peasant's average income.