I hope your answer will help me with pitch stabilizators

Every day that i play Juno, i want to create a plane with fully rotateble rear stabilizators like f4 fantom or f18 hornet. To solve this problem i had founded craft "training plane" in stock crafts. I had looked at stabs and found an input of them:
clamp(
(Pitch * (1 - min(FlightData.SurfaceVelocityMagnitude * 0.002, 0.75)))
+ (Roll * 0.25)
+ (0.5 * Slider1),
-1, 1)
Please explain me how does it work and how to create input like that for my plane