Complex sentence: Peter of Spain or, in Latin, Petrus Hispanus (13th century) is the Mediaeval author of "Tractatus", a standard textbook on logic, and often credited with a number of works on medicine.
Split into simpler sentences: Peter of Spain or, in Latin, Petrus Hispanus Literally "Spanish Peter" or "Peter the Spaniard". His is also often credited with a number of works on medicine.