Just use the "colSpan" attribute for the element <TableCell>.
Example:
render() {
return (
<Table className={classes.table}>
<TableBody>
<TableRow>
<TableCell>Data 1</TableCell>
<TableCell>Data 2</TableCell>
</TableRow>
<TableRow>
<TableCell colSpan={2}>Data Two Columns</TableCell>
</TableRow>
</TableBody>
</Table>
);
}
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