perl -F: -pale '$"=":"; $_ = "@F[1,5..$#F]"' input-file.txt

 awk -F: '
    {
       a = $2
       for ( i = 6; i <= NF; ++i )
          $(i-5) = $(i)
       NF -= 5
       print a, $0
    }
 ' OFS=":" input-file.txt

 sed -e '
    s/^/:/;s/:/\n/6
    h;s/.*\n//
    x;s/\n.*//
    s/^://;s/:/\n/2
    s/^/:/;s/:/\n/2
    s/.*\n\(.*\)\n.*/\1/
    G;s/\n/:/
  '  input-file.txt

 perl -F: -pale '$"=":"; $_ = "@F[1,5..$#F]"' input-file.txt

 awk -F: '
    {
       a = $2
       for ( i = 6; i <= NF; ++i )
          $(i-5) = $(i)
       NF -= 5
       print a, $0
    }
 ' OFS=":" input-file.txt

 sed -e '
    s/^/:/;s/:/\n/6
    h;s/.*\n//
    x;s/\n.*//
    s/$/:/
    s/^://;s/:/\n/2
    s/^/:/;s/:/\n/2
    s/.*\n\(.*\)\n.*/\1/
    G;s/\n/:/
  '  input-file.txt