Complex sentence: It has two professional theatres, the Obie Theatre, which can seat audiences of up to 324 and standing audiences up to 500; and the BRIT Theatre, which opened in January 2012 and seats audiences of up to 280.
Split into simpler sentences: It has two professional theatres, the Obie Theatre, which can seat audiences of up to 324 and standing audiences up to 500. The BRIT Theatre opened in January 2012 and seats audiences of up to 280.