Barry, if you're not familiar with the procedure:
type your sentence into a cell then select that cell and more to its right
until you have enough/the ones you want selected. The use the Format option
for cells to set horizontal alignment to "Center Across Selection".
A second option is to enter your sentence into a cell and set the cell's
"Text Wrap" option to 'false' (clear the checkbox next to "Text Wrap") and
simply make sure there are no entries in any cells to the right of it that
stop the display of the text.