I have a data frame column that I need to split into 3 separate column. Looks like this:

```
I:500-600
I:700-900
II:200-250

```

I'd like to split this into the following 3 columns:

```
V1 V2 V3
I 500 600
I 700 900
II 200 250

```

This has proved slightly trickier than I had hoped. Any help would be appreciated.