cat << EOF | awk 'BEGIN{FS=OFS="- "} NF>1{$1="";sub(/^- */, "")}'1
Adam James - Welcome Home.txt
Mike & Harry - One Upon - A Time.txt
William-Kent - Prince & The Frog.txt
Mike & Harry - One-Upon - A Time.txt
EOF
Y2F0IDw8IEVPRiB8IGF3ayAnQkVHSU57RlM9T0ZTPSItICJ9IE5GPjF7JDE9IiI7c3ViKC9eLSAqLywgIiIpfScxIApBZGFtIEphbWVzIC0gV2VsY29tZSBIb21lLnR4dApNaWtlICYgSGFycnkgLSBPbmUgVXBvbiAtIEEgVGltZS50eHQKV2lsbGlhbS1LZW50IC0gUHJpbmNlICYgVGhlIEZyb2cudHh0Ck1pa2UgJiBIYXJyeSAtIE9uZS1VcG9uIC0gQSBUaW1lLnR4dApFT0Y=