Read the following passage. whenever we go to see our friend, we take the bus, which is usually an express bus, except on weekends. we have learned after taking the bus so many times that we will have to wait a long while for it because the bus is almost always late. we don't mind, and because we are used to it, we always ride it. in the passage, which characteristic of sentence structure is the most evident? very formal organization complex sentence structure varied sentence lengths simple sentences

I believe this an example of complex sentence structure.

My reasoning is that most of these sentences are in fact compound complex sentences-

Compound-complex sentences contain two independent clauses and at least one dependent clause.

An example of a complex sentence is this: “I burned dinner but not the cake.”

because each is self-sufficient.  

- "a nonrestrictive clause functions as a modifier to a noun (that is an object, person or concept). these clauses can be described by the following three options: it is set off by comas, it contains a subject and a verbs and it adds nonessential information to the sentence.

for example, in "here is bill gates, who confounded microsoft software company" we can identify "who confounded microsoft software company" as a nonrestrictive clause modifying the noun bill gates. this clause can be describes as a nonrestrictive clause because it is separated by a comma, it adds nonessential information to identify who bill gates is and it must contain both a subject (who) and a verb (confounded)."