Complex sentence: In 1994 the Europa Block was added to the school so that more classrooms were available specifically for languages, since then a new Maths Block, Science Block and separate Sixth Form block have been added to the school grounds.
Split into simpler sentences: In 1994 the Europa Block was added to the school to increase the number of classrooms available, specifically for languages. Since then a new maths block, science block and separate Sixth Form block have been added to the school grounds.