Complex sentence: The action was "an embarrassing defeat" for the Marines who engaged in much "finger-pointing" to assess blame for the defeat, with Puller blaming Griffith and Edson, Griffith blaming Edson, and Twining blaming Puller and Edson.
Split into simpler sentences: The action was "an embarrassing defeat" for the Marines. The Marines engaged in much "finger-pointing" to assess blame for the defeat, with Puller blaming Griffith and Edson, Griffith blaming Edson, and Twining blaming Puller and Edson.