Complex sentence: Jane also thinks she knows more about fashion than anyone else because the French Court was so fationable at the time she wear lots of french styles of cloth and is very jumpy about her cloths and her reputation for her beauty.
Split into simpler sentences: Jane also thinks she knows more about fashion than anyone else because the French Court was so fashionable at the time. She wear lots of French styles of clothes and is very jumpy about her clothes and her reputation for her beauty.