Complex sentence: Moxie Marlinspike (pseudonym) is an American computer security researcher, whose research focuses primarily on techniques for intercepting communication, as well as methods for strengthening communication infrastructure against interception.
Split into simpler sentences: Moxie Marlinspike (pseudonym) is an American computer security researcher. His research has focused primarily on techniques for intercepting communication, as well as methods for strengthening communication infrastructure against interception.