Complex sentence: His brothers by adoption include Oliver Prinz von Anhalt, Michael Prinz von Anhalt and Markus Maximilian Prinz von Anhalt, as well as a sister, Francesca Hilton, who is the stepdaughter of his adoptive father and birth daughter of his adoptive mother.
Split into simpler sentences: His brothers by adoption include Oliver Prinz von Anhalt, Michael Prinz von Anhalt and Markus Maximilian Prinz von Anhalt. His sister by adoption is Francesca Hilton, who is the stepdaughter of his adoptive father and birth daughter of his adoptive mother.