Complex sentence: Dunlop introduced a technology that turned vulcanized rubber sap into latex foam that became widely used until today as latex mattresses and latex pillows (hence the name Dunlopillo), at first it was only sold to royalties in the British Empire.
Split into simpler sentences: Dunlop introduced a technology that turned vulcanized rubber sap into latex foam that became widely used until today as latex mattresses and latex pillows (hence the name Dunlopillo). Initially it was only sold to royalties in the British Empire.