Complex sentence: Plastered temple roof combs are similar to some of the friezes above in that they usually show large representations of rulers, which may again be seated on a symbolic mountain, and set within a cosmological framework (as on Palenque's Temple of the Sun).
Split into simpler sentences: Plastered temple roof combs are similar to some of the friezes above in that they usually show large representations of rulers. These may again be seated on a symbolic mountain, while being set within a cosmological framework (as on Palenque's Temple of the Sun).