Complex sentence: Original M-1941 jackets are used as collectibles but are quite scarce and finding originals in large sizes is also very rare but many different reproductions of this jacket have become plentiful in America and are made to fit modern people.
Split into simpler sentences: Original M-1941 jackets are used as collectibles but are quite scarce and finding originals in large sizes is also very rare. Many different reproductions of this jacket have become plentiful in America and are made to fit modern people.