Simplify the following text for a Grade 4 native English-speaking person.
Original: Southend United Football Club is an English football club based at Roots Hall Stadium , Prittlewell , Southend-on-Sea , Essex , who currently play in League Two of the English Football League .
Simplified: Southend United F.C. are an English football club . They are based in Southend-on-Sea in the county of Essex .