Complex sentence: Marietta Edgecombe is a Ravenclaw student, with curly reddish-blonde hair, and is part of Cho Chang's cadre of giggling Ravenclaw girlfriends; her mother works for the Floo Network authority in the Ministry.
Split into simpler sentences: Marietta Edgecombe is a Ravenclaw student, with curly reddish-blonde hair, and is part of Cho Chang's cadre of giggling Ravenclaw girlfriends. Her mother works for the Floo Network authority in the Ministry.