Complex sentence: This operation required many more laborers to come to the city to help, they built the Borate and Daggett Railroad was built to haul borax ore from the mines up in the hills down to Daggett.
Split into simpler sentences: This operation required many more laborers to come to the city to help. The Borate and Daggett Railroad was built to haul borax ore from the mines up in the hills down to Daggett.