Multi.1080p.r-mg.part1.rar: T0a2022

This indicates the file contains multiple audio tracks (often several different languages).

This is the "tag" for the release group that encoded and uploaded the file. t0a2022 MULTi.1080p.R-MG.part1.rar

This is the resolution, meaning it's Full HD quality. This indicates the file contains multiple audio tracks

This is the first segment of a compressed archive. t0a2022 MULTi.1080p.R-MG.part1.rar

Here is a quick breakdown of what that file name actually means: