Complex sentence: Economy is managed generally by building farms (Good side) also Gondor can build blacksmiths to both upgrade troops and accumulate resources; slaughterhouses, lumber mills and furnaces (Evil side) on the predefined slots to gain resources.
Split into simpler sentences: Economy is managed generally by building farms (Good side). Slaughterhouses, lumber mills and furnaces (Evil side) can be built on the predefined slots to gain resources.