Simplify the following text for a Grade 7 native English-speaking person.
Original: On 9 April 1919 , Miss Marcella Sherwood , who supervised the Mission Day School for Girls was cycling round the city to close her schools when she was assaulted by a mob in a narrow street , the Kucha Kurrichhan , was beaten and left wounded .
Simplified: On April 9 1919 , Miss Marcella Sherwood , who worked at the Mission Day School for Girls was bicycling round the city to close her schools . She was attacked by the mob in a narrow street and was beaten and left wounded .