Complex sentence: Williamson's real first name is Mervyn; however when he was a child, he was a bit of a troublemaker, so his Nana gave him the nickname "Skip" after Percy Crosby's character "Skippy".
Split into simpler sentences: Williamson's real first name is Mervyn, however when he was a child, he was a bit of a troublemaker. As a result, his Nana gave him the nickname "Skip" after Percy Crosby's character "Skippy".