If you have a column and the front element is in close combat then the front element does not do a sponno move. The second element would have to do a sponno move, but it will be in the enemy TZ, which will normally mean none of the directions is possible, so it stays in place but counts as having moved.
The next bit is open to interpretation.
One interpretation is as I gave before, the column stands still as a column. This is the easiest to apply, although probably a bending of the exact rule wording. (added later) Phil has clarified on the Yahoo group that this is how he interprets it.
Depending on base depths, the next element may be out of the TZ. It can't wheel so it can't move as a column with the element behind, so maybe it could move as a single element and use one of the bullet points to leave the column. Usually the element in front blocks its move so it stands still as none of the directions is possible, and so on as each element tries to move. So usually the net result is the same as the simple interpretation above.
OK, now suppose the column has no element in close combat. Depending on the situation, the front element may not be able to wheel (hence move as a column), nor move straight ahead, but it may be able to move by a shift or dog-leg as a single element to achieve one of the allowed directions.
The rules are intentionally framed so that if sponno elements are in a column they normally stay as a column, and do not split apart. They could be better worded, but they are as good as we managed to get in the time available.