Complex sentence: During AMC's formative years the company struggled with costs and sales, Abernathy, as Vice President of Sales, kept many of the dealers allied with AMC, thus helping to keep the corporation afloat until it found it's niche under Romney.
Split into simpler sentences: During AMC's formative years the company struggled with costs and sales. Abernethy, as Vice President of Sales, kept many of the dealers allied with AMC, thus helping to keep the corporation afloat until it found its niche under Romney.