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Why is this an issue?

  goto is an unstructured control flow statement. It makes code less readable and
  maintainable, and is not recommended in modern code.

How to fix it

  Use condition variables with structured control flow statements such as if,
  for, while, Continue, or Break instead.

  function Foo: Boolean;
  var
    Sentence: string;
  begin
    for I := 1 to 10 do begin
      Sentence := Sentence + Readln;

      if Input = '.' then begin
        goto SentenceEnded;
      end;
    end;

    ShowMessage('Cutting off the sentence here');
  SentenceEnded:
    ShowMessage('Sentence: ' + Sentence);
  end;

function Foo: Boolean;
var
  Sentence: string;
  SentenceShown: Boolean;
begin
  for I := 1 to 10 do begin
    Sentence := Sentence + Readln;

    if Input = '.' then begin
      ShowMessage('Sentence: ' + Sentence);
      SentenceShown := True;
      Break;
    end;
  end;

  if not SentenceShown then begin
    ShowMessage('Cutting off the sentence here');
    ShowMessage('Sentence: ' + Sentence);
  end;
end;

Resources

  
    
      Stack Overflow: What is wrong with using goto?
    
  
  
    
      Dijkstra (1968). Go To Statement Considered Harmful