Instructions: 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.
Input: Sentence 1:Since Guignes ' time , considerable scholarly effort has been devoted to investigating such a connection . Sentence 2:However , there is no scholarly consensus on a direct connection between the dominant element of the Xiongnu and that of the Huns .
Output:
however