Complex sentence: The night of June 10,1903, the original Seelberg-Cannstatt plant suffered a great blaze destroying all machinery and 93 finished "Mercedes" (quarter of the annual production).
Split into simpler sentences: The night of June 10,1903, the original Seelberg-Cannstatt plant suffered a great blaze. Being destroyed all machinery and 93 finished "Mercedes" (quarter of the annual production).