Complex sentence: A reorganization of frontier defenses in 1775 resulted in the transfer of the garrison, enlarged to 56 officers and men, 40 miles north to a site in present-day downtown Tucson, Arizona.
Split into simpler sentences: A reorganization of frontier defenses in 1775 resulted in the transfer of the garrison. The force was enlarged to fifty-six officers and men and received orders to proceed forty miles north to a site within present-day downtown Tucson, Arizona.