Complex sentence: In fuzzy clustering, data elements can belong to more than one cluster, and associated with each element is a set of membership levels which indicate the the strenght of the association between that dats element and a particular cluster.
Split into simpler sentences: In fuzzy clustering, data elements can belong to more than one cluster, and associated with each element is a set of membership levels. These indicate the the strength of the association between that data element and a particular cluster.