Complex sentence: Princess Sickness (Chinese: 公主病) is used to describe spoilt females, especailly teenagers, with symptoms like being self centered, self-indulgent and eager to be princesses.
Split into simpler sentences: Princess Sickness (Chinese: 公主病) is a kind of living attitude of some female. Females that have princess sickness are usually self centered, self-indulgent and wanna-be princesses.