Globally Speaking

Speak in simple sentences. This doesn't mean talking as if your listeners are infants. It also doesn't mean curt, clipped sentences. It means avoiding unnecessary complexity in your sentences, such as convoluted subordinate clauses and modifier phrases.

An example of complexity:
     The other day, during our annual meeting, when most of us were thinking about the company's future, we heard, for the first time, some forecasts which, you will agree, were very encouraging.

A simpler version:
     Most of us were thinking about the company's future during our annual meeting. We heard some new forecasts which were very encouraging.