Complex sentence: Beatrice was diagnosed with dyslexia in 1994 and went public with the diagnosis in 2013 when it was announced that she would become patron of the Helen Ariel Dyslexia Centre.
Split into simpler sentences: Beatrice was diagnosed with dyslexia in 1994 and went public with the diagnosis in 2013. As she went public with this information, it was announced that she would become patron of the Helen Ariel Dyslexia Centre.