Complex sentence: A good rule of thumb is to have no more than 25--40 hives in a permanent apiary, although migrating beekeepers may temporarily place one hundred hives into a location with a good nectar flow.
Split into simpler sentences: A good rule of thumb is to have no more than 25--40 hives in a permanent apiary. Although, migrating beekeepers may temporarily place one hundred hives into a location with a good nectar flow.