Complex sentence: Foote was born in Greenville, Mississippi, the son of Lillian (née Rosenstock) and Shelby Dade Foote, whose father, a planter, had gambled away most of his fortune and assets.
Split into simpler sentences: Foote was born in Greenville, Mississippi, the son of Shelby Dade Foote and his wife Lillian Rosenstock. Foote's paternal grandfather, a planter, had gambled away most of his fortune and assets.