String Data Parsing - Touchdesigner to Arduino to MG995 Servos

Projects General Guidance
2

That code will not work with even 1 servo.

You need to create instances (construct) of the servos. For 1 servo:

Servo servo;
Servo servo[5]; // create an array of servos

You need to attach the servo.

servo.attach(3);

Servos do not use the analogWrite function. They use servo.write(degrees) or servo.writeMicroseconds(us).

I suggest that you look at the serial input basics tutorial for ideas on reading serial input and parsing the data.