The US arm of SABMiller, Miller Brewing Company, is to undergo a restructuring of its corporate staff, resulting in loss of approximately 200 positions and a strategic realignment of many others, company officials announced yesterday.  "Given the context of our new business priorities and turnaround plans, a very detailed assessment of the organization has taken place over the past few months," Miller president and CEO Norman Adami said.   "This redesign is not just about a staffing reduction but also about multiple role and job changes.  It's about alignment of the organization and creating the right shape for the business for the future."