That would depend on what sort of detail you want to include. We would also need to know if you are working with only a gedcom file you downloaded from, say, Ancestry, or do you have a desktop genealogy program that you could use to view the information.
How many people are we talking about?
To be honest, I use a desktop program, Ancestry, and FamilySearch. It is tedious, but I copy/paste from each into WikiTree. I like to write the text, such as biography, marriage info, etc. first, and then fill in the sources and inline citations from all three. There really isn't a completely easy way. You have to develop a "system" that works for you. For instance, I also incorporate notepad and Excel, but I think that is more than you wanted to know.
