Complex sentence: By extension it has also been used as a synonym for Puck and through its use as a nickname for a character in Sir Walter Scott's "Kenilworth" it has gained the meaning of an impish child.
Split into simpler sentences: By extension it has also been used as a synonym for Puck. Through its use as a nickname for a character in Sir Walter Scott's "Kenilworth", it has gained the meaning of an impish child.