Complex sentence: For two days, Miller stayed bivouacked, ignoring repeated order to resume his advance to the Rapids, until Hull finally realized that Miller was not going to obey, and ordered him to return to Detroit.
Split into simpler sentences: For two days, Miller stayed bivouacked, ignoring repeated orders from Hull to resume his advance to the Rapids. Finally, Hull realized that Miller was not going to obey him, and ordered him to return to Detroit.