Complex sentence: Finlay was born Juan Carlos Finlay y Barres, in Puerto Príncipe (now Camagüey), Cuba, of French (from his mother) and Scottish (from his father) descent.
Split into simpler sentences: Finlay was born Juan Carlos Finlay y Barres, in Puerto Príncipe (now Camagüey), Cuba. He was of French (from his mother) and Scottish (from his father) descent.