Complex sentence: These corresponded in weight to only 20 carats, but matched with the weight of the worn solidii that were circulating in those areas at the time, and the two coins circulated together in these areas for a time.
Split into simpler sentences: These corresponded in weight to only 20 carats, but matched with the weight of the worn solidii that were circulating in those areas at the time. The two coins circulated together in these areas for a time.