Complex sentence: The attack on the Austrian left would entail pushing it back towards the Austrian centre, and in an even more unorthodox move De Gages asked Maillebois to take his troops beyond the extreme right of the line, encircle the Austrian right flank and fall on its rear.
Split into simpler sentences: The attack on the Austrian's left would entail pushing it back towards the Austrian center. In an unorthodox move, De Gages asked Maillebois to take his troops beyond the extreme right of the line, encircle the Austrian right flank and fall on its rear.