Here is a sentence structure that I can't understand. Ask god for advice.

Bright, an Irish potato, contributes to this familiar phenomenon. It is an unrestricted attributive clause that modifies noun phrases such as farmers and others who are eager for land. According to the grammatical rules of attributive clauses, the to before it is advanced, and if it is restored, it should be placed after contributed, which is also a fixed collocation of contribute to.

Why is it ahead of schedule? In order to balance the sentence, it will not cause the phenomenon of top-heaviness, and if it is not in advance, it will be connected with the following to. Whether reading or writing, it does not conform to the pronunciation and writing habits of British and American people, and it is not beautiful.

The famine caused by the large-scale withering of Irish potatoes forced farmers and others to emigrate on a large scale, starting from Europe and moving to North America and Oceania.