Complex sentence: The Elizas monopoly on the main route was broken in 1869, when first she was taken off the main route her owners led by Captain Finch, replaced her with the newer "Olympia".
Split into simpler sentences: The Elizas monopoly on the main route was broken in 1869, when first she was taken off the main route. Her owners led by Captain Finch, replaced her with the newer "Olympia".