一些有关于...的东西 means someting about.一些=someting.For example,一些有关于莎士比亚的东西=someting about Shakespeare.As for 有关于，关于，有关,there are no differences among them.You can say再和我聊一些关于莎士比亚的东西。It's right

再次和我聊一些有关莎士比亚的东西 100%right.In this sentence 有关于，关于，有关 are playing the same roll.You can freely replace one for another, but in other situations these words may have a little difference in meaning.有关于and 关于 are 100% same.有关could be used as a verb like this:-----这两件事有关(系）吗？----有关（系）！In this little dialoge you can not replace 有关 with 有关于or 关于。一些 means a little. Back to the reginal sentence, you can say it in these ways following: 再次和我聊一些有关于（有关）（关于）莎士比亚的东西。 再次和我聊一些莎士比亚的东西. I prefor this one.Most Chinese speak like this.Sounds naturally. 再次和我聊莎士比亚的东西.