I imported a dataset looks like this.

```
Peak, Trough
0   1857-06-01, 1858-12-01
1   1860-10-01, 1861-06-01
2   1865-04-01, 1867-12-01
3   1869-06-01, 1870-12-01
4   1873-10-01, 1879-03-01
5   1882-03-01, 1885-05-01
6   1887-03-01, 1888-04-01

```

it is a CSV file. But when I check the `.shape`, it is

```
(7, 1)

```

I thought CSV file can automatically be seperated by its commas, however this one doesn't work.

I want to split this column into two, sperated by comma, and also the column names as well. How can I do that?