Like the Bowmaker the Longbowmaker turns wooden logs into Longbows.
This time it uses Hardwood to make more powerful weapons and while a slow job it is wise to get an upgraded hut placed as soon as you can and allow Bows to pile up over a period of time.
Upgrading is a medium to low priority as once you build a longbow army you tend to lose very few in battle so you wont be replenishing them all that often.