Complex sentence: The majority of CFDs are traded OTC using the "direct market access" (DMA) or "market maker" model, but in 2007 the ASX introduced exchange traded CFDs and a small percentage of CFDs are now traded through the Australian exchange.
Split into simpler sentences: The majority of CFDs are traded OTC using the "direct market access" (DMA) or "market maker" model, but in 2007 the Australian Securities Exchange (ASX) introduced exchange traded CFDs. As a result a small percentage of CFDs are now traded through the Australian exchange.