Why does "those" come before "structure" in this sentence?
I think the latter is singular and the former is plural.
In general, the simpler plants appeared on the Earth before those more complicated structure.
The quoted sentence is ungrammatical. Where did you find it?
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At the link below, the sentence is just a little different:
https://www.urch.com/forums/topic/10625-new-questions/
In general, the simpler plants appeared on the Earth before those more complicated in structure.
That is, ... appeared ... before those