Complex sentence: Mutsumi is stated as being very well endowed and her hourglass figure is downplayed by her clothes, with her bust being the biggest of all the girls, Which is used for comical effect and fan service many times throughout the anime/manga series.
Split into simpler sentences: Mutsumi is stated as being very well-endowed even though her hourglass figure is downplayed by her clothes. Her bust the biggest of all the girls, which is used for comical effect and fan service many times throughout the anime/manga series.