Complex sentence: The whole western end of Ardnamurchan is a large "caldera" which is a crater left behind by a collapsed volcano and makes Ardnamurchan popular with geologists where the tapping of geology hammers to obtains samples can often be heard in the summer months.
Split into simpler sentences: The whole western end of Ardnamurchan is a large "caldera". This makes Ardnamurchan popular with geologists and the tapping of geology hammers to obtains samples can often be heard in the summer months.