Complex sentence: Henryk Batuta--the biggest hoax to date on the Polish Wikipedia, it was an article about a person who never existed, originally created on November 8 2004, the hoax was exposed 15 months later when the article was listed for deletion.
Split into simpler sentences: Henryk Batuta--the biggest hoax to date on the Polish Wikipedia, involving an article about a person who never existed, originally created on November 8 2004. The hoax was exposed 15 months later when the article was listed for deletion.