Complex sentence: Knowing exactly what Priya wants, he pursues her and they fall in love but their happiness is shattered when Priya, one day goes to Immy's room, finds her diary, realizing he has read her diary and lied to her.
Split into simpler sentences: Knowing exactly what Priya wants, he pursues her and they fall in love. Their happiness is shattered when Priya one day goes to Immi's room, finds her diary, realizing he has read her diary and lied to her.