Complex sentence: Just the before the train starts, Sidharth runs out to throw the diary containing the truth in a dust bin and comes back, but Bhoomi takes back the diary from the dust bin without Sidharth's knowledge and reads it.
Split into simpler sentences: Just the before the train starts, Sidharth runs out to throw the diary containing the truth in a dust bin and comes back. But Bhoomi takes back the diary from the dust bin without Sidharth's knowledge and reads it.