 Known Lucayan settlement sites are confined to the nineteen largest islands in the archipelago, or  smaller cays located less than one km. from those islands.
<fluency>  Known Lucayan settlement sites are confined to the nineteen largest islands in the archipelago, or  smaller cays located less than one km. from those islands.
 Known Lucayan settlement sites are confined to the nineteen largest islands in the archipelago, or to smaller cays located less than one km. from those islands.