Complex sentence: Tony recognized that Richie's absence was on account of his imprisonment and promised to give him his due, which offer Richie immediately rebuffed by saying that what is his is not Tony's to give.
Split into simpler sentences: Tony recognized that Richie's absence was on account of his imprisonment. Tony promised to give Richie his due, an offer which Richie immediately rebuffed by saying that what is his is not Tony's to give.