You'd need an extremely powerful microscope to see something so small.
The watch mechanism is extremely intricate and very difficult to repair.
His diaries show him to have been an extremely insecure person.
In successive stages extremely long plans were formed of which probably only the newest phase(s) would have been in use.
Accepting the purely syntactic part of this extremely simple analysis, let us consider the semantics of the sentence.
Second, it must be noted that present extremely low levels of development are largely due to the failures of past centralised regimes.
