Imported my store twice causing duplicated data. How do I delete/ fix?

[hunterxpm]

Hello, 

I switched my eCommerce site over to Shopify from Squarespace, in the process I imported my data twice. This caused two problems:

1. My customers appear as: Hunter Bergman Hunter Bergman, with their names repeated

2. Orders were duplicated.

I'm working with over 1,000 customers and orders, so it's a decent amount of data.

What is the easiest way to fix this?