Complex sentence: His solitary life is shared only with the local midwife, Caroline Middey, and Clee--a Nez Perce horseman and childhood friend--until two half-wild, starving and very pregnant teen-aged girls arrive at the edge of his field.
Split into simpler sentences: His solitary life is shared only with the local midwife, Caroline Middey, and Clee, Nez Perce a horseman and childhood friend. This is until two half-wild, starving and very pregnant teen-aged girls arrive at the edge of his field.