Complex sentence: He is a past president of SFWA, the Science Fiction and Fantasy Writers of America (2005 to 2007) and has also hosted three of SFWA's Nebula Awards weekends, two events in the Kansas City, Missouri area, where he currently resides.
Split into simpler sentences: He is a past president of SFWA, the Science Fiction and Fantasy Writers of America (2005 to 2007) and has also hosted three of SFWA's Nebula Awards weekends. Two of the Nebula events in the Kansas City, Missouri area, where he currently resides.