What process is where weiosis sister cells chromatids are separated and pull to opposite ends of the cell?

The process you are referring to is called anaphase II of meiOSis. During this stage, the sister chromatids of each chromosome are separated and pulled toward opposite poles of the cell by the spindle fibers. This ensures that each daughter cell will receive one copy of each chromosome, ultimately leading to the formation of four genetically diverse haploid cells at the end of meiOSis.