Complex sentence: Tom hears him and places his soup spoon directly in front of him, making Quacker fall into a can of water, but before Tom can eat Quacker, Jerry whacks the spoon into the back of Tom's throat with a plank.
Split into simpler sentences: Tom hears him and places his soup spoon directly in front of Quacker, resulting in Quacker falling in the can of water. Just before Tom can eat Quacker, Jerry saves him by whacking the spoon into the back of Tom's throat with a plank.