Complex sentence: This chiefly consisted of coal in the area north of Llanelly, and around Saundersfoot; in addition limestone was also quarried around Llanelly, and on a smaller scale further west and north.
Split into simpler sentences: This chiefly consisted of coal in the area north of Llanelly and around Saundersfoot. Limestone was also quarried around Llanelly, and on a smaller scale further west and north.