Complex sentence: The site for the 1879 exhibition was an area within the grounds of the medieval St Mary's Abbey known as Bearparks Garden, fronted by what became Exhibition Square cleared by the demolition of a house and the former Bird in Hand hotel.
Split into simpler sentences: The site for the 1879 exhibition was an area in the grounds of the medieval St Mary's Abbey known as Bearparks Garden. It is fronted by what became Exhibition Square which was cleared by the demolition of a house and the former Bird in Hand Hotel.