Passing a text file to a C shell inside a bash script

Scripting/Programming
1

There’s a section of code on Stack Exchange that I’m trying to manipulate. In the original scenario, it takes some user input and moves files of a certain age to another directory, whilst maintaining the directory structure:

destination=$(cd -- "$destination" && pwd) # make it an absolute path
cd -- "$source" &&
find . -type f -mtime "-$days" -exec sh -c '
  for x do
    mkdir -p "$0/${x%/*}"
    mv "$x" "$0/$x"
  done
' "$destination" {} +

How can I modify this so that it reads a list of files and moves them to another folder whilst maintaining the directory structure? The list of files is relative to the shell but I can make it absolute if necessary. I tried turning it into a read loop but it didn’t work, because I suck:

cd $sourcedir
sh -c '
  while read x do
    mkdir -p "$0/${x%/*}"
    mv "$x" "$0/$x"
  done
' <"$filesin" | tee -a "$filesout" >/dev/null