Simplify the following text for a Grade 11 native English-speaking person.
Original: The most well-known example is Finnish modernist architect Alvar Aalto who would create aesthetic effects in the facades of his buildings through the combination of different types and sizes of louvers , some fixed some moveable , and made mostly from wood ( e.g. the various buildings of the Helsinki University of Technology ) .
Simplified: The most well-known example is Finnish modernist architect Alvar Aalto who would create aesthetic effects in the facades of his buildings through the combination of different types and sizes of louvers . Some are fixed and some are moveable .