You are using a comma but should be using the dot '.'. FPF is seeing these as different arguments separated by commas.
// this will work (note the dots instead of the comma)
$pdf->Cell(110, 7,$address1 . ' - ' . $address2);
// I prefer this: it is easier to read
$fullAddress = $address1 . ' - ' . $address2;
$pdf->Cell(110, 7,$fullAddress);
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