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.
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.