I am looking for simple powerhell script to import termSet .csv file into TermGroup. What will be the simple script to accomplish this?
There was a same question on stackexchange and answered.I hope this article helps you out.
How to import term sets to Managed Metadata Service using PowerShell and CSV file
Also the below TechNet article explains the CSV file format for metadata termset values. https://technet.microsoft.com/en-us/library/ee424396.aspx
However if you have the well formatted CSV file, you can easily import it through Central Administration UI. Go to CA -> Managed Metadata Service -> Your TermGroup -> Right Click and import.