Complex sentence: The first two tiers provide office space for about 50,000 people, on the third tier there will be a hotel with 2,500 rooms, while the top tier is a residential block for more than 300 homes.
Split into simpler sentences: The first two tiers provide office space for about 50,000 people. On the third tier, there will be a hotel with 2,500 rooms, while the top tier is a residential block for more than 300 homes.