Complex sentence: In the southern portion of the state, the San Pedro River overtoppled Arizona State Route 92 along the Palominas and the Hereford Bridge, causing both bridges to be closed, while $30,000 in damage occurred when the river overflows its bank near Mammoth.
Split into simpler sentences: In the southern portion of the state, the San Pedro River overtoppled Arizona State Route 92 along the Palominas and the Hereford Bridge, causing both bridges to be closed. Near the headwaters of the San Pedro River, an additional $30,000 in damage occurred when the rivers overflows its bank near Mammoth.