Complex sentence: Cox's father-in-law to-be, John Catsimatidis, the Gristedes supermarket and oil magnate, raised ethical issues about Demos' time at the SEC, saying he was accused of improprieties, and the subject of a related disciplinary complaint.
Split into simpler sentences: Cox's father-in-law to-be is John Catsimatidis, the Gristedes supermarket and oil magnate. Catsimatidis raised ethical issues about Demos' time at the SEC, saying he was accused of improprieties, and the subject of a related disciplinary complaint.