That which is an example of a complex sentence is: As industrial robots became more common, many laborers who lacked skills lost their jobs.
A complex sentence is a sentence with one dependent clause and one independent clause.
In the sentence above, we find an example of a dependent and independent clause being used to form a complex sentence.
The first half of the sentence separated by the comma is the dependent clause while the second half is the independent clause.
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Explanation:
I don't understand it....
They wanted to ratify the Articles of Confederation.
4, from July 28th 1914 to November 11th 1918