I have problems analyzing the constituents of the following sentence: 德国人不习惯他们旁边围满了人
德国人不习惯他们旁边围满了人。
Germans are not used to having a lot of people around them.

(whoever wrote this has never been to the Oktoberfest or any Bierfest)

A Chinese sentence does not have to conform to the grammatical standards of English.

德国人
Germans
不习惯
not used to
他们旁边围
their surroundings
满了人。
full people