Complex sentence: Eather has been criticised, particularly by the author, Williams, for disengaging from battle too soon and ceding victory to Kusonose when the latter at an impasse and frustrated--having committed his reserve, he was still unable to break the Australian defence.
Split into simpler sentences: Eather has been criticised, particularly by the author, Williams, for disengaging from battle too soon and ceding victory to Kusonose when the latter was at an impasse and frustrated. Having committed his reserve, Kusonose was still unable to break the Australian defence.