Complex sentence: After the failed attempt at eluding the General, Rainsford builds a "Malay man catcher", a weighted log attached to a trigger, which injures Zaroff's shoulder, causing him to return home for the night.
Split into simpler sentences: After the failed attempt of eluding the General, Rainsford builds a Malay-man-catcher; a weighted log attached to a trigger. This contraption injures Zaroff's shoulder causing him to return home for the night.