Complex sentence: Biased random walks on graphs provide an approach for the structural analysis of undirected graphs in order to extract their symmetries when the network is too complex or when it is not large enough to be analyzed by statistical methods.
Split into simpler sentences: Biased random walks on graphs provide an effective tool for the detailed structural analysis of undirected graphs exposing their symmetries. It is an approach to extract the symmetries of the network when the network is too complex to be studied or when it is not large enough to use the statistical methods.