Complex sentence: After marriage, Karan and Sanjana's family life deteriorates badly, with Karan wanting domestic stability and Sanjana being a horrible home maker, something that is confirmed when she ends up burning down his apartment while "trying" to switch off a washing machine.
Split into simpler sentences: After marriage, Karan and Sanjana's family life deteriorates badly, with Karan wanting domestic stability and Sanjana being a horrible home maker. This is shown when she burns his apartment down while "trying" to switch off a washing machine.