Complex sentence: Sherlock apologises to John that he has no idea how to defuse it, and begs forgiveness for past upset he had caused; after some anger, Watson tearfully forgives Sherlock for his long absence.
Split into simpler sentences: Sherlock apologises to John that he has no idea how to defuse it and begs forgiveness for past upset he had caused. After some anger, John tearfully forgives Sherlock for his long absence.