I have a column as below:

```
       A
0   Australia
1   New Zealand
2   New Jersey,America
3   Hyderabad,India

```

I want to split it in two columns where there is ',' separator such as:

```
        A                  B
0   Australia             NaN
1   New Zealand           NaN
2   New Jersey,America  America
3   Hyderabad,India      India

```

Any suggestion is welcomed