Complex sentence: It was built style of a "Chehel Sotoun"-a Persian style 40-pillar public audience hall, in a style similar to the Diwan-i-Aam at the Agra Fort.
Split into simpler sentences: It was built style of a "Chehel Sotoun"-a Persian style 40-pillar public audience hall. Its design is similar to the Diwan-i-Aam at the Agra Fort.