Board Thread:Support Requests - Getting Technical/@comment-580911-20140123130143/@comment-4902411-20140123153919

I believe you are confused between the number of cells in a row and splitting a cell altogether. The first example you provided, would display two cells, a header and a data one. The second one would change the row and display a header, occupying two columns, and a data cell. The third one would simply have a header, occupying two columns. The last one won't work, as there is no pipe after the markup. It would display two cells, and it will not "split" them.

See mw:Help:Tables for a detailed explanation.