* Elementary sartorial techniques: This refers to basic sewing techniques.
* Initially applied: This means that these techniques are used at the beginning of a project.
* Preclude repetitive similar actions: This means that these techniques help avoid doing the same thing over and over again.
* To the square of three: The square of three is 3 * 3 = 9. This means that the techniques help eliminate 9 times the number of repetitive actions.
In simpler terms: Basic sewing techniques used at the start of a project can help you avoid repeating the same steps nine times.
Example: Imagine you are making a dress. You could sew each seam individually, which would be very repetitive. However, using a technique like basting (temporary stitching) before sewing the seams together would allow you to sew them more accurately and efficiently, thus avoiding a lot of repetitive stitching.
The sentence is unnecessarily complicated and uses technical jargon. It's more straightforward to simply say that basic sewing techniques help save time and effort by reducing repetition.