SimpleDifficulty-1.12.2-0.3.4-128х.zip is a release file of the Minecraft resource pack Simple-Difficulty, made for Minecraft 1.12.2. It was published on January 30, 2021 and is 1.3 MB in size. For the full description, screenshots and every other version, visit the Simple-Difficulty resource pack page.
How to install: Put the .zip into .minecraft/resourcepacks (do not extract it) and enable it under Options → Resource Packs.