Complex sentence: During this bridal preparation ritual, turmeric paste is placed on the bride's skin for the purpose of improving and brightening her complexion, after which mehndi is applied on the bride's hands and feet by the "mehndiwali", a female relative.
Split into simpler sentences: During this bridal preparation ritual, turmeric paste is placed on the bride's skin for the purpose of improving and brightening her complexion. Then henna or mehndi, is applied on the bride's hands and feet, by the "mehndiwali", a female relative.