Complex sentence: From there it flowed northwest then north through Hospital Creek Canyon around Mount Oso into San Joaquin County then turns east to dip back briefly over the border into Stanislaus County before turning back north into San Joaquin County flowing tnen northeast to emerge from the Diablo Range foothills.
Split into simpler sentences: From there it flows northwest then north through Hospital Creek Canyon around Mount Oso into San Joaquin County. It then turns east to dip back briefly over the border into Stanislaus County before turning back north into San Joaquin County flowing tnen northeast to emerge from the Diablo Range foothills.