Unless writing for a scientific journal, or some other such formal setting, your goal of clear communication will be best served by using a casual, conversational style that resonates as closely as possible with how you would talk to your reader in person.

That means prepositions are very much something you can end a sentence with. And you can start one with a conjunctive too, if it feels right. The rules of grammar are more like the pirate code than an ISO standard - they're more what you might call guidelines, really.