Complex sentence: Since 2004, AGP has been progressively phased out in favor of PCI Express (PCIe); by mid- 2008, PCI Express cards dominated the market and only a few AGP models were available.
Split into simpler sentences: Since 2004, AGP has been progressively phased out in favor of PCI Express (PCIe). By mid- 2008, PCI Express cards dominated the market and only a few AGP models were available.