Complex sentence: Russo argues that the Antilles coordinates must have been known to Ptolemy source which is Hipparcos and that Hipparcos, who lived in Rhodes, may have got this information from Phoenicians sailors, since they had full control of the western Meditteranean in those times.
Split into simpler sentences: Russo argues that the Antilles coordinates must have been known to Ptolemy source, which was Hipparcos. Hipparcos lived in Rhodes and may have got this information from Phoenicians sailors, since they had full control of the western Meditteranean in those times.