Complex sentence: However, Cadet reveals this background by telling a story to his overly rambunctious niece and nephews who expressed no prior knowledge of this, it is unknown whether or not this is true or just his attempt to impress his relatives.
Split into simpler sentences: However, Cadet reveals this background by telling a story to his overly rambunctious niece and nephews who expressed no prior knowledge of this. It is unknown whether or not this is true or just his attempt to impress his relatives.