Complex sentence: Karan is heartbroken to hear all this, and decides to go back to Mumbai, and is about to board his flight, when at the last moment, he spots a picture of Tanya (as Natasha) on a club advertisement printed across an airport Taxi.
Split into simpler sentences: Karan is heartbroken to hear all this, and decides to go back to Mumbai. He is about to board his flight, when at the last moment, he spots a picture of Tanya (as Natasha) on a club advertisement printed across an airport Taxi.