Complex sentence: Granny Smith is the "wise matriarch of the Apple family" and grandmother of Applejack, Apple Bloom, and Big McIntosh whose memory is "a bit fuzzy", and her "wit is as sharp as a tack".
Split into simpler sentences: Granny Smith is the grandmother of Applejack, Apple Bloom, and Big McIntosh. She is depicted as a "wise matriarch" whose memory is "a bit fuzzy", and her "wit is as sharp as a tack".