Complex sentence: The industry's first third-party SBus cards were announced in 1989 by Antares Microsystems; these were a 10Base-2 Ethernet controller, a SCSI-SNS host adapter, a parallel port, and an 8-channel serial controller.
Split into simpler sentences: The industry's first 3rd party SBus cards were announced in 1989 by Antares Microsystems. These were: a 10Base-2 Ethernet Controller, a SCSI-SNS Host Adapter, a Parallel Port, and an 8-Channel Serial Controller.