Two sentences

[nyggus]

Hi, are the following sentences correct?

This fantastic programming language offers many valuable features, each being of great importance in a problem of data grouping; it enables to apply modern techniques easily and, at last but not at least, very efficiently. For this reason, I think that this language is worth to be recommened to all participants of the course.

Thanks in advance,
Nyggus

[Tdol]

each being of great importance in a problem of data grouping- each of great importance to the problem of data grouping. (the sounds better to me- how many problems are there?)
it enables to apply modern techniques- it enable the application of modern techniques/it makes it possible to apply modern techniques
at last but not at least- last but not least
worth to be recommened- recommending

[nyggus]

each being of great importance in a problem of data grouping- each of great importance to the problem of data grouping. (the sounds better to me- how many problems are there?)
it enables to apply modern techniques- it enable the application of modern techniques/it makes it possible to apply modern techniques
at last but not at least- last but not least
worth to be recommened- recommending

Thanks, tdol
As for your two corrections: "it enables..." and "recommending": were my options incorrect or just yours sound better?

Nyggus

[Tdol]

Incorrect- enable + infinitive (enanable + pronoun + infinitive ) and worth is followed by a gerund.