It was as a physician that
这是强调式.
正常如下:
He represented himself as a physician ,and as such he was warmly received
这样就好理解了.
as such 是个词组,这里取第一个意思:就以这种身份(或名义、资格)；他受到热烈欢迎.
就以这种身份(或名义、资格)；如所指的人(或事物)那样
就其本身而论,就这一点而论；本身[见such]
像这样的(人或事物)；以这种名义(或身份,资格)
本身；就这一点而论
像样的,真正的