Original sentence: The 45 rpm discs also came in a variety known as Extended play (EP) which achieved up to 10–15 minutes play at the expense of attenuating (and possibly compressing) the sound to reduce the width required by the groove
Edited sentence: The 45-rpm discs also came in a variety known as extended play (EP) which achieved up to 10–15 minutes play at the expense of attenuating (and possibly compressing) the sound to reduce the width required by the groove