Englishfor English speakers
effort
Noun
—
The amount of work that is done on something.
A great amount of effort was put into this event; we had over 4,000 visitors.
clause
Noun
—
A clause is a section in a contract or other legal document.
The author's contract contained a clause giving him creative control over the films.
—
A clause is a group of words that usually includes a subject and a predicate. In English, the subject usually comes before the predicate.
The last clause in the sentence is hard to understand without knowing some background.