Simplify the following text for a Grade 8 native English-speaking person.
Original: Viola has been shipwrecked in a violent storm off the coast of Illyria ; in the process she has lost her twin brother , Sebastian .
Simplified: The leading character , Viola , is shipwrecked on the shores of Illyria during the opening scenes . She loses contact with her twin brother , Sebastian , whom she believes to be dead .