Simplify the following text for a Grade 15 native English-speaking person.
Original: By 1985 the development of Baroque instruments and the technique of the players was such that the LBS choir was able to perform the St Matthew Passion with a complete orchestra of period instruments and this they did for the opening concert of the 1985 Bath International Music Festival in Wells Cathedral and later in 1987 at Westminster Abbey , the latter being the last time Steinitz conducted the work .
Simplified: By 1985 there were enough professional players of Baroque instruments in England for the LBS choir to be able to perform the St Matthew Passion with a complete orchestra of period instruments in Wells Cathedral and later in 1987 at Westminster Abbey