Complex sentence: The single also made it to number one the soul singles chart, for four non consecutive weeks: an unusual occurrence in that, on the soul singles chart, "Green Onions" fell in and out of top spot, three times.
Split into simpler sentences: The single also made it to number one the soul singles chart, for four non consecutive weeks. An unusual occurrence in that, on the soul singles chart, "Green Onions" fell in and out of top spot, three times.