Complex sentence: But Nidhi gets to know the truth and Nidhi and Ashutosh search for Khushi, who runs away from her uncle and again starts living with Nidhi and Ashutosh.
Split into simpler sentences: But Nidhi gets to know the truth and Nidhi and Ashutosh search for Khushi. Khushi runs away from her uncle and again starts living with Nidhi and Ashutosh.