Complex sentence: The original structure was built with dressed stones that were probably brought from East End or even Scrub Island and the lime mortar for jointing was made from a mixture burnt coral and shells with admixtures of molasses and marl.
Split into simpler sentences: The original structure was built with dressed stones that were probably brought from East End or even Scrub Island. The lime mortar for jointing was made from a mixture of burnt coral and shells with admixtures of molasses and marl.