Split column in two

Hello,

My table has the following structure:



I need to analyse the variance of views by page title from the periods in column B: 2016 vs 2015.

For that, I'm using Power BI desktop. I'm trying to split column B in two: one with the period 1/jan/2015-19/ago/2015 and other with 1/jan/2015-19/ago/2015

Is this possible to do? How?
I tried unpivoting but it didn't work.

Thanks in advance for helping!