Complex sentence: Barney has grown tired of his Ducky Tie and makes up a story in order to hide the fact that he has thrown the tie away, but he is foiled when Lily enters the bar holding the tie which she found in the garbage.
Split into simpler sentences: Barney has grown tired of his Ducky Tie and makes up a fake story in order to hide the fact that he has thrown the tie away. However, it is foiled when Lily enters the bar holding the tie she found in the garbage.