Complex sentence: Kajal thinks that she is responsible for Karan's death as she had asked him for a ride in a bad weather and also loses her mental balance and ends up in a hospital after attempting suicide.
Split into simpler sentences: Kajal thinks that she is responsible for Karan's death, as she had asked him for a ride in bad weather. After Karan's death, Kajal loses her mental balance and ends up in a hospital due to attempting suicide.