Best control structure for task of aligning motor with sensor

Projects General Guidance
3

Allan, thanks for the reply. I wrote a simple sketch that does just that. The sensors behave exactly as I want. I came the closest with a fairly long if, else statement:

void loop ()

{
  checkForDarkness;
  digitalWrite(ROTATE_INTERRUPT, LOW); //switch off rotate interrupt amber LED
  //checkSensors;
  //delay(60000);
  sensorValue_centerPCell = analogRead(centerPCell);
  sensorValue_topPCell = analogRead(topPCell);
   
  if (sensorValue_centerPCell <= sensorValue_topPCell)
  {
    digitalWrite (RELAY_TILT_DOWN, LOW);
    digitalWrite (RELAY_TILT_UP, HIGH);
  delay(1000);
  sensorValue_centerPCell = analogRead(centerPCell);
  sensorValue_topPCell = analogRead(topPCell);
  
   }
   else if (sensorValue_centerPCell > sensorValue_topPCell)
   {
     digitalWrite (RELAY_TILT_UP, LOW);
      }
    else if (sensorValue_topPCell > sensorValue_centerPCell && sensorValue_bottomPCell > sensorValue_centerPCell)
{
     
      digitalWrite (RELAY_TILT_UP, LOW);
      digitalWrite (RELAY_TILT_DOWN, LOW);
      digitalWrite (SHADED_SENSOR_LED, HIGH);
}



sensorValue_centerPCell = analogRead(centerPCell);
  sensorValue_bottomPCell = analogRead(bottomPCell);
   
  if (sensorValue_centerPCell <= sensorValue_bottomPCell)
  {
    digitalWrite (RELAY_TILT_UP, LOW);
    digitalWrite (RELAY_TILT_DOWN, HIGH);
  delay(1000);
  sensorValue_centerPCell = analogRead(centerPCell);
  sensorValue_bottomPCell = analogRead(topPCell);
  
   }
   else if (sensorValue_centerPCell > sensorValue_topPCell)
   {
     digitalWrite (RELAY_TILT_DOWN, LOW);
}
}

It is a clumsy attempt, but this is the stage I am at in the learning curve right now. I know there is an elegant solution, but it continues to elude me.