Complex sentence: The Opera House was converted from the original (1881) Mauch Chunk concert hall which was the second story to a first floor farmer's market providing an appropriate background to the strains of "Arlington" and the lyric of "Deeper Well".
Split into simpler sentences: The Opera House's second story was converted from the original 1881 Mauch Chunk concert hall and It is currently a first floor farmer's market. The unique background perfectly suites the strains of "Arlington" and the lyrics of "Deeper Well".