move.sh

#!/bin/bash

# Go into every directory 1 level inside current directory
for dir in */; do
    # Move files with extension .parquet from sub-directory to current directory
    find "$dir" -maxdepth 1 -type f -name "*.parquet" -exec mv -t . {} +
done

# Rename those files by removing sub-string -parquet- from their names
for file in *.parquet; do mv "$file" "${file/-parquet-/}"; done