Complex sentence: Mia's grandmother, who loves Sidecars, is highly critical of everyone around her, and has a hairless poodle, Rommel and she calles Michael Moscovitz "that boy".
Split into simpler sentences: Mia's grandmother, who loves Sidecars, is highly critical of everyone around her. She has a hairless poodle, Rommel, and she calls Michael Moscovitz "that boy".