Complex sentence: However, she still questions their relationship at times, due to Garfield's lack of a feminine side and rudeness, and she is aggravated by Garfield's teasing and gluttony, but still holds affection for him.
Split into simpler sentences: However, she still questions their relationship at times, due to Garfield's lack of a feminine side and rudeness. She is aggravated by Garfield's teasing and gluttony, but still holds affection for him.