Paste the following in your terminal, then press Enter and follow any prompts:
xcode-select --install
Install Homebrew by pasting this line in the terminal and pressing Enter
ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
Again, at the terminal, paste this line and press enter
brew update && brew install pandoc
$ pandoc --from latex --to docx -o myConvertedFile.docx myLatexSource.tex
$ pandoc --from docx --to latex -o myConvertedFile.tex myLatexSource.docx