That braided terrain is a ridge of ejecta from Arzachel that bisects the floor of Alphonsus - it is often said to be part of the Imbrium Sculpture but is not. If you look closely at the left hand side of the ridge in your image you can see that there is a line of elongate secondary craters just peeping out from beneath it - these craters formed first during the Arzachel impact event. The ridge then formed as a result of, I suspect, collimated plumes of debris that was ejected from the crater northwards, and were deposited over the surface, including the secondary craters that formed earlier. The ridge has a herringbone pattern typical of interfering ejecta deposits - you can see this in you image. The reason this ridge is here is that Arzachel is a low angle impact crater, with the impactor having arrived from the south - not low enough to produce an elliptical crater, but low enough to influence the ejecta pattern.
You can see something similar if you look at Cardanus - also a low angle impact from the south (but not as low as Arazachel probably). Here two converging crater chains (one being Rima Cardanus) stretch away from Cardanus and across the floor of Krafft, where they converge on the northern rim. The crater chains are then overlaid by later ejecta that drapes the surface and partially obscures the chains. Same process as seen in Arzachel.
The ridge across Alphonsus divided that crater into two, the eastern half then filled with volcanic deposits of some form, but the ridge prevented the spread of these deposits across the western half - thats why in low angle images the two halves of Alphonsus look so different, with the western floor looking more heavily cratered and older.