I'm currently remaking an old novella of mine and making it longer and more detailed, along with a few added and deleted plot points, but I've got the plot of the first novel planned, along with the second. While in between those 2 will be around 15 books, each varying in length. The plot would be of 600 years of the main antagonist of the first novel hunting down each of the people in the bloodline of the main protagonist. But I think that, while the 15 books would bridge the 600 year gap, it may make it needlessly complex,but I don't want it too simple. I was mainly wanting to use them not only to bridge the time gap, but also to show the antagonist's physical transformation and mental transformation which ties in with the plot, so I need some kind of help with this, like how to make it less complex etc. If anymore information is needed, feel free to ask. Thanks in advance to any help.