original: The county's elevation decreases toward the east, with the lowest height in the Siret River valley.
simplifications: The country's reaches its lowest height east in the Siret River valley. The county is more flat in the east with the lowest point in the Siret River valley. The county's elevation decreases east. With the lowest point in Siret River valley. The county's elevation decreases toward the east. The lowest height is in the Siret River valley. The county's elevation falls toward the east. The lowest height is in the Siret River valley. The county's elevation goes down toward the east.  The lowest height is in the Siret River valley. The country is lower in the east. It's lowest point is the Siret River valley. The county's elevation decreases toward the east. The lowest height is found in the Siret River valley. The county's elevation decreases towards the east with the lowest height at the Siret River valley. The elevation of the county declines towards the east, with the lowest height in the valley of the Siret River.