Complex sentence: During the time of the Iberian Union, between 1580 and 1640, four different pretenders claimed to be the returned King Sebastian; the last of these pretenders, who was in fact an Italian, was hanged in 1619.
Split into simpler sentences: During the time of the Iberian Union, between 1580 and 1640, four different pretenders claimed to be the returned King Sebastian. The last of these pretenders, who was in fact an Italian, was hanged in 1619.