Complex sentence: It is unclear which one was Henderson island and which one Pitcairn, a confusion with the original name of Ducie was later produced by a chart by Admiral José de Espinosa, who marked it as "La Encarnación", instead of "Luna Puesta".
Split into simpler sentences: It is unclear which one was Henderson island and which one Pitcairn. The confusion was later compounded when a chart produced by Admiral José de Espinosa marked Ducie as "La Encarnación", instead of "Luna Puesta".