Copying Rows And Separating Tables

I have an excel sheet that I'm trying to format. Basically, the excel book contains sheets (with the months), and each sheet contains a list of clients, their package, their status, date assigned, and date updated.

I've made another sheet (Sheet2) that fetches everything and consolidating it to one sheet. Sheet 2 also cleans up the data to display only the items that are 'completed'.

The issue I'm having now is in splitting the list (assuming it has been cleaned up to show only the 'completed' items. I would need to split the list first by the date they were updated, and then if they were assigned the same date or not. In short:

--Get all items with date updated = Month1
----If date assigned = Month 1: List items under table 1
----If date assigned < Month 1: List items under table 2

I've used macro on the excel (and I'm not sure it's efficient enough. I'm not proficient with VB, so...). I'm not sure if it will work on Mac.