You will be given a definition of a task first, then some input of the task.
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:The inability of the MIU system to express or deduce facts about itself , such as the inability to derive MU , is a consequence of its simplicity . Sentence 2:However , more complex formal systems , such as systems of mathematical logic , may possess this ability .
Output:
however