Complex sentence: He later visits Jacoby at his office and hands in his resignation, pointing out the obvious that he doesn't fit in with the company and he doesn't belong there, which his father-in-law understands and accepts his resignation.
Split into simpler sentences: He later visits Jacoby at his office and hands in his resignation, pointing out that he doesn't fit in nor belong in the company. His father-in-law understands and accepts his resignation.