Original sentence: In an attempt to correct this situation, Apple has done work for adding support for Common Access Cards to their operating system right out of the box using the MUSCLE (Movement for the Use of Smartcards in a Linux Environment) project.The Common Access Card, has historically been supported only by Windows machines; however, an increasing number of Department of Defense workstations are using operating systems such as Linux or Mac OS X
Edited sentence: Fortunately, Apple has done work for adding support for Common Access Cards to their operating system right out of the box using the MUSCLE (Movement for the Use of Smartcards in a Linux Environment) project.The Common Access Card, historically, has only been supported by Windows machines, however an increasing number of Department of Defense workstations are using operating systems such as Linux or Mac OS X