Complex sentence: Of Senatorial rank, the Imperial Legate was appointed by the Emperor and usually held command for 3 or 4 years, in the present time, an Imperial Legate would be called a General.
Split into simpler sentences: Of Senatorial rank, the Imperial Legate was appointed by the Emperor and usually held command for 3 or 4 years. In the present time, an Imperial Legate would be called a General.