You are probably sending the value over with Serial, right? Then you just need to send all the values from the different sensors with delimiters and assign different variables to them respectively.
Example :
Arduino :
int values[3];
void setup() {
//initialize serial communications at a 9600 baud rate
Serial.begin(9600);
}
void loop() {
values[0] = analogRead(A0);
values[1] = analogRead(A1);
values[2] = analogRead(A2);
//the individual sensors values
Serial.println(value[0] + "split" + value[1] + "split" + value[2]);
//you can use any char/String as a delimiter
delay(100);
}
Processing :
Serial myPort;
String val; // Data received from the serial port
int[] intVals;
void setup() {
String portName = Serial.list()[0]; //change the 0 to match your port
myPort = new Serial(this, portName, 9600);
}
void draw() {
if ( myPort.available() > 0) { // If data is available,
val = myPort.readStringUntil('\n'); // read it and store it in val
}
intVals = int(split(val, "split"));
//you can use splitTokens(val, delimiters) to split on multiple token.
println(val, intVals); //print it out
}