Complex sentence: Whenever Fuddy threatens to fire the girls, Nugget makes himself invisible and becomes a helping friend; he is always battling Fuddy and takes delight in harassing him in odd and humorous ways.
Split into simpler sentences: Whenever Fuddy threatens to fire the girls, Nugget makes himself invisible and becomes a helping friend. Nugget is always battling Fuddy and takes delight in harassing him in odd and humorous ways.