Complex sentence: The islands take their name from Saint Marcouf, a saint who died on the Îles Saint-Marcouf on 1 May 588, and there was a monastic presence on the islands until the 15th century.
Split into simpler sentences: The islands take their name from Saint Marcouf, a saint who died on the Îles Saint-Marcouf on 1 May 588. There was a monastic presence on the islands until the 15th century.