Original: Inheriting a collapsing empire and faced with constant warfare during his reign against both the Seljuk Turks in Asia Minor and the Normans in the western Balkans, Alexios was able to halt the Byzantine decline and begin the military, financial, and territorial recovery known as the "Komnenian restoration".
Simplified: The military, financial and territorial recovery of the Byzantine Empire known as Komnenian restoration began in his time.