Complex sentence: The community applied for a Post Office under the name "Dewey" in honor of Admiral George Dewey; however, since another community-Dewey, Oklahoma-had that name, the reversed name "Yewed" was assigned to the community.
Split into simpler sentences: The community applied for a Post Office under the name "Dewey" in honor of Admiral George Dewey. However, since another community-Dewey, Oklahoma-already had that name, the leters were reversed and the name "Yewed" was assigned to the community.