Original sentence: Since 1994, a period that has been called "the steroids era" by Dan Patrick  and Neil Hayes, thirteen more players have joined the Club by hitting 50 or more homers 21 times; three players — Sosa, McGwire and Bonds — have hit 60 or more homers a total of six times, and two of them have broken the 70 home run plateau
Edited sentence: Since 1994, a period that has been called "the steroids era" by Dan Patrick  and Neil Hayes , thirteen more players have joined the Club by hitting 50 or more homers 21 times; three players — Sosa, McGwire and Bonds — have hit 60 or more homers a total of six times, and two of them have broken the 70 home run plateau