Complex sentence: Note that the original recipe was invented in 2006, when a single Snickers bar had a weight of 62.5g, which was subsequently reduced to 58g in 2009, and to 48g in 2013.
Split into simpler sentences: Note that the original recipe was invented in 2006, when a single Snickers bar had a weight of 62.5g. This weight was subsequently reduced to 58g in 2009, and to 48g in 2013.