Complex sentence: Tryon showed concern for the well being of his men and the better ordering of the navy: before "Raleigh" had left England, thirty men had deserted from the ship, and more took the opportunity to escape all ships of the squadron at Montevideo.
Split into simpler sentences: Tryon showed concern for the wellbeing of his men and the better ordering of the Navy. Before "Raleigh" had left England, thirty men had deserted from the ship, and more took the opportunity to escape from ships of the squadron at Montevideo.