The part of a sentence "expends considerable effort" is correct and usable in written English.
You can use this phrase to talk about the amount of effort someone has put in to do something. For example, "John expends considerable effort into his studies and always does well in his exams."
For its part, Amazon continues to expend considerable effort both to dominate this small, fragile market and to win the hearts and minds of readers.
It took him about ten minutes to make the trip each time, a delay sufficiently irritating that Obama's assistant expended considerable effort to avoid it.
Columbia coaches, alumni and administrators have expended considerable effort trying to figure out how the university can maintain at least modest success in a high-profile sport like football.
It is keeping us safe from unruly cocker spaniels now, as well as school bullies -- or, at least, expending considerable effort telling us that it is keeping us safe.
By this time, Richardson had already expended considerable effort on trying to get Asylum, Patrick McGrath's novel about events in a psychiatric hospital modelled on Broadmoor in the 1950s, translated to the cinema screen.
The festival has always expended considerable effort in getting a major Hollywood film to kick off proceedings, but in the last two years it has excelled itself: 2014 saw Birdman open the festival, and the year before that Gravity.
Patients with stroke must expend considerable effort to weight shift, which often induces associated reactions (AR), and spasticity [14, 15].
Furthermore, the language proficiency requirements have become so strict that certain groups will be unable to comply with them, even if they expend considerable effort in the process.
Schlick expended considerable effort discussing the differences between intuitive acquaintance and conceptual knowledge, insisting that, even though intuitive images are real, acquaintance with them does not constitute knowledge.
Almost immediately rumours circulated that ministers had expended considerable effort trying to get the NFU on side ahead of the announcement.
