Complex sentence: It was designed by architect Andrei Mikhailov (who had also built the nearby Maly Theatre in 1824) and it opened on 18 January 1825 as the Bolshoi Petrovsky Theatre with a performance of Fernando Sor's ballet, "Cendrillon".
Split into simpler sentences: It was designed by architect Andrei Mikhailov, who had built the nearby Maly Theatre in 1824. The Moscow theatre was inaugurated on 18 January 1825 with a performance of Fernando Sor's ballet, "Cendrillon".