Simplify the following text for a Grade 10 native English-speaking person.
Original: Due to rising numbers of pupils in the 1960s and 1970s , the school moved again in 1981 to its present site ( which was a former hospital ) overlooking the Westminster School playing fields in Vincent Square .
Simplified: Due to rising numbers of pupils in the 1960s and 1970s , the school moved again in 1981 to its present site ( which was a former hospital ) next the Westminster School playing fields in Vincent Square .