Given the task definition and input, reply with output. In this task, you are given two sentences in the English language (Sentence 1 and Sentence 2). Your task is to identify the connecting word between the two sentences.

Sentence 1:He has previously served as the chairman of Instinet , prior to Silver Lake 's exit from that company . Sentence 2:Additionally , he has served on the board of such Silver Lake portfolio companies as TD Ameritrade , Seagate Technology , MCI , Inc. , Gartner and Sabre Holdings .
additionally