Complex sentence: Schmidt died in 1957 after being bitten by a juvenile boomslang snake ("Dispholidus typus") which he doubted could produce a fatal dose, so he administered no antivenin until it was too late to counteract the effects of the boomslang's venom.
Split into simpler sentences: Schmidt died in 1957 after being bitten by a juvenile boomslang snake ("Dispholidus typus") which he doubted could produce a fatal dose, so he administered no antivenin. Schmidt underestimated the severity of the snakebite and, as a result, did not seek medical treatment until it was too late to counteract the effects of the boomslang's venom.