Simplify the following text for a Grade 4 native English-speaking person.
Original: Sussex , from the Old English SÅ `` Ã 3\/4 sÄ `` axe ( ` South Saxons ' ) , is an historic county in South East England corresponding roughly in area to the ancient Kingdom of Sussex .
Simplified: Sussex is a historic county in South East England . Its area is more or less the same as that of the ancient Kingdom of Sussex .