Complex sentence: The building is an elliptical eggshell that is truncated on the northern and western sides, by screen walls which reveal the interior activity space to the street level, which derived from the building position of the north-west corner of the site near the existing school.
Split into simpler sentences: The building is an elliptical eggshell that is truncated on the northern and western sides, by screen walls which reveal the interior activity space on the street level. This derived from the building position of the north-west corner of the site near the existing school.