Complex sentence: The cause of the conflicts was like many of the Indian Wars in history, in 1684, the Spanish colonists in the present day Mexican state of Sonora, discovered silver in the Rio Yaqui Valley.
Split into simpler sentences: The cause of the conflicts was like many of the Indian Wars. In 1684, the Spanish colonists in the present day Mexican state of Sonora discovered silver in the Rio Yaqui Valley.