Simplify the following text for a Grade 7 native English-speaking person.
Original: The `` Yurovsky Note , '' an account of the event filed by Yurovsky to his Bolshevik superiors following the murders , was found in 1989 and detailed in Edvard Radzinsky 's 1992 book The Last Tsar .
Simplified: The `` Yurovsky Note '' was found in 1989 and described in Edvard Radzinsky 's 1992 book The Last Tsar . The `` Yurovsky Note '' was a description of the event by Yurovsky after the execution .