Complex sentence: Let the hyper-surfaces of constant energy in the 2s-dimensional phase space of the system be metrically indecomposable and let\\ left\\ langle\\ cdot\\ right\\ rangle_t denote time avarage.
Split into simpler sentences: Let the hyper-surfaces of constant energy in the 2s-dimensional phase space of the system be metrically indecomposable. Let\\ left\\ langle\\ cdot\\ right\\ rangle_t denote time avarage.