Complex sentence: Avalanches are cross-classified by the mode of failure propagation, and the type of flow transport; there is only one mechanism by which an avalanche comes to rest, through the dissipation of inertial energy into friction.
Split into simpler sentences: Avalanches are cross-classified by the mode of failure propagation, and the type of flow transport. There is only one mechanism by which an avalanche comes to rest, through the dissipation of inertial energy into friction.