There are other ways to change your data into text.
one is concatenate. this is just taking two things and making it one string.
another if the printf, similar to concatenate
there is also the dtostrf() function.
this takes your numerical values, float or whatever and turns it into a string.
then you can add strings together.
int potValue = analogRead(pinSensor);
float volts = 5*(float)potValue/1023;
char tmp[25] = "Pot Voltage = "; // creates 25 character wide array and loads text into the first area
dtostrf(volts,1,2, &tmp[12]); // play with [12] to get positioning
Serial.println(tmp); // prints the new line