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Catholic Encyclopedia
http://www.newadvent.org/cathen/14002a.htm
Pope St. Simplicius, d. 483.
For All the Saints
http://www.saintpatrickdc.org/ss/0310.htm#simp
Brief profile.
Popes Through the Ages
http://www.cfpeople.org/Books/Pope/POPEp47.htm
Account of the pontificate of St. Simplicius, from the book by Joseph Brusher.
The Ecole Glossary
http://www2.evansville.edu/ecoleweb/glossary/simplicius.html
Short entry on Pope St. Simplicius mentions that he opposed Monothelitism.