Please make the following text more coherent.
En route they encountered severe weather, but the weather cleared by the time they crossed the Colorado River at Yuma, Arizona. Near Tacna, Arizona, an engine failed and the pilot made a rough landing on the desert.
En route they encountered severe weather, but the weather cleared by the time they crossed the Colorado River at Yuma, Arizona. However, near Tacna, Arizona, an engine failed and the pilot made a rough landing on the desert.