Complex sentence: A majority can be compared to a plurality, which is a subset larger than any other subset considered; i.e. a plurality is not necessarily a majority as the largest subset considered may consist of less than half the set's elements.
Split into simpler sentences: A majority can be compared to a plurality, which is a subset larger than any other subset considered. A plurality is not necessarily a majority as the largest subset considered may consist of less than half the set's elements.