Complex sentence: He has a daughter, Fleurette, who appears in Sir Percy Hits Back and is unaware of his identity as a leading politician; his marital status and whether or not he has other children is unknown.
Split into simpler sentences: He has a daughter, Fleurette, who appears in Sir Percy Hits Back and is unaware of his identity as a leading politician. Also, his marital status and whether or not he has other children is unknown.