Complex sentence: Because cattle farming and sailing were the main means of livelihood in the areas concerned, large storage ares for the harvest were not needed, so that Uthland-Frisian houses had no space for grain and hay storage apart from the attic.
Split into simpler sentences: Because cattle farming and sailing were the main means of livelihood in the areas concerned, large store rooms for the harvest were not needed. As a result Uthland-Frisian houses had no space for grain and hay storage apart from the attic.