Complex sentence: To get in contact with me outside of Wikipedia, you may email me if you are a registered user; click on the Toolbox selection to the left of this page, and an "E-mail this user" option will pop up.
Split into simpler sentences: To get in contact with me, apart from Wikipedia, you may email me. If a registered user, click on the Toolbox selection to the left of this page, and an "E-mail this user" option will pop up.