I know there are many ways to root a LG Optimus L70 LGMS323 but I don't understand some of it. Is there a simple way to root my of device running Android 4.4.2?
Use the first method first for safer rooting. There are chances of bricking the phone while rooting. Warranty will be void if applicable. No guaranty is implied that it will work on the device because each device follows a particular procedure.
Developer Options > USB debugging in Settings before doing anything. This option might help you recover/repair phone if any mishap occurs.