Original: After the occupation of Bohemia and Moravia on 15 March 1939 and the Slovak declaration of an independent state, Ruthenia declared its independence (Republic of Carpatho-Ukraine) but was immediately occupied and later annexed by Hungary.
Simplified: After the occupation of Bohemia and Moravia on March 15, 1939 and the Slovak declaration of an independent state, Ruthenia declared its independence (Republic of Carpatho-Ukraine) but it was immediately occupied and later annexed by Hungary.