Complex sentence: Catterns'force fought a desperate action through the night and the day of 21 November while the rest of the battalion pressed forward against Japanese positions that were threatened by Catterns' manoeuvre; the defenders fell back through the night and into the morning.
Split into simpler sentences: Catterns'force fought a desperate action through the night and the day of 21 November while the rest of the battalion pressed forward against Japanese positions that were threatened by Catterns' manoeuvre. The defenders fell back through the night and into the morning.