Complex sentence: Excavations have uncovered no burial chambers or other underground works, which may indicate that it was used as a look-out or hill fort; there is evidence that there was a considerable amount of stone on the top of hill.
Split into simpler sentences: Excavations have uncovered no burial chambers or other underground works. This may indicate that it was used as a look-out or hill fort; there is evidence that there was a considerable amount of stone on the top of hill.