Yes, so sorry about that!<br /><br />Here are the two options I thought might work for you (or some iteration of either):<br /><br />
<p>Over the span of six years, I taught business school at the MBA level, and then taught&nbsp;economics to undergraduates, with classes ranging from small to large.</p>
<p>OR</p>
<p>Over the span of six years, I taught economics at the undergraduate level and then taught business school at the MBA level, with classes ranging from small to large.</p>
Please let me know if you need anything else or additional options.<br /><br />Thanks,<br />EditPro