I wouldn't say just because you can't understand Shakespeare you shouldn't read it. This obviously is from a different era. Many of the early church fathers works are in very difficult prose but is worth figuring out. Heck, sometimes my pastor sounds like this. :O)
You have my deepest sympathy. ;-)
there is an excellent book on preaching titled A Handful of Stars by Maurice Berquist and Gerald Marvel. Gerald is a retired pastor and a good friend of mine. Best preaching speaker I have ever heard. You could always give it to your pastor as a gift.
Pastor's, and their flocks would be better served by emulating the preaching of Christ rather than giving theology lectures.
Gerald Marvel would rarely preach for more than 30 minutes. He believed that if you can't get the point across in 30 minutes, you definitely can't do it in an hour. Prior to his retirement five years ago, he asked the congregation to submit requests of sermons people would like to hear again. Of the 12 or so he preached the last three months of his ministry, I distinctly remembered at least ten of them, some of them preached at least 5-19 years earlier. He also never preached from notes, but even if you were to listen to him preach in successive services, there ere only rare, and slight deviations in the words used.
BTW, he barely graduated from college, but he was a man of God. Far from being perfect, and he easily acknowledged it as well.