Here is a simple solution
Names Default To Here( 1 );
Begining = "This";
Middle = "is a";
End = "sentence";
StringList = {"Begining", "Middle", "End"};
Sentence = Eval( Parse( StringList[1] ) );
For( i = 2, i <= N Items( stringList ), i++,
Sentence = Sentence || " " || Eval( Parse( StringList[i] ) )
);
Show( sentence );
Jim