My first language is not English. I am currently preparing for the IELTS exam. Today I saw a YouTube video about the IELTS writing task. In this video, the teacher gave an example of a complex sentence which is:
"The amount of people from an English town deciding to start a vegetarian diet increased steadily by approximately 125 from about 75 to 200 between 2004 and 2007. "
In another video, the teacher gave some more examples of complex sentences:
Between 2004 and 2007, the number of people increased steadily from about 75 to 200.
There was a steady increase in the number of people from about 75 to 200 between 2004 and 2007.
The number of people becoming vegetarian experienced a steady increase from about 75 to 200 between 2004 and 2007.
I myself cannot see any subordinate clause or dependent clause in the four sentences. I do not know why are they considered complex sentences. Can anyone help me ASAP please? My IELTS exam is very near :(.
Thanks a lot.