Complex sentence: Firedamp is explosive at concentrations between 4% and 16%, with most explosions occurring at around 10%, and caused much loss of life in coal mines before the invention of the Davy lamp.
Split into simpler sentences: Firedamp is explosive at concentrations between 4% and 16%, with most explosions occurring at around 10%. It caused much loss of life in coal mines before the invention of the Davy lamp.