Complex sentence: Historically, the crags have been quarried for limestone, and there are also several disused lead mines; the land use is currently a mixture of heather moorland managed for Black Grouse, improved sheep pasture and conifer plantation.
Split into simpler sentences: Historically, the crags have been quarried for limestone, and there are also several disused lead mines. The land use is currently a mixture of heather moorland managed for Black Grouse, improved sheep pasture and conifer plantation.