Complex sentence: The Fountain was marginally controversial because one of the requirements for membership was that one donate all worldly assets to the group prior to joining; for most who joined the Fountain, however, this was irrelevant since few had much in the way of possessions anyway.
Split into simpler sentences: The Fountain was marginally controversial because one of the requirements for membership was that one donate all worldly assets to the group prior to joining. For most who joined the Fountain, however, this was irrelevant since few had much in the way of possessions anyway.