Complex sentence: In addition to tax collection, law enforcement and legal disputes took the major part of the magistrate's time and energy, and one of the most important elements in his annual review for promotion was his ability to catch thieves and prosecute robberies.
Split into simpler sentences: In addition to tax collection, law enforcement and legal disputes took the major part of the magistrate's time and energy. One of the most important elements in his annual review for promotion was his ability to catch thieves and prosecute robberies.