Complex sentence: The De Redin Towers are a series of thirteen small fortified watch towers that Grand Master Martin de Redin of the Knights of Malta built on the island of Malta between the year 1658 and 1659.
Split into simpler sentences: The De Redin Towers are a series of small fortified watch towers that the Knights of Malta built on the island of Malta. Thirteen were built under the auspices of Grand Master Martin de Redin between the year 1658 and 1659.