Complex sentence: Gaudí was hired in September to design its new home, and on February 2 of 1905 the project was presented to the City Council and the work began demolishing the existing building instead of reforming it, as in the case of the Casa Batlló.
Split into simpler sentences: Gaudí was hired in September to design his new home, and on February 2 of 1905 the project was presented to the City Council and the work began. It was decided to demolish the existing building rather than reforming it, as had been done in the case of the Casa Batlló.