He has repeatedly demonstrated an ability to quickly master essentials of a complicated new field to select important problems which are accessible and to apply intense energy and insight to their solution making liberal use of deep results of other mathematicians in widely differing areas

Can you repeat this sentence, but add in punctuation?
He has repeatedly demonstrated an ability to quickly master essentials of a complicated new field, to select important problems which are accessible, and to apply intense energy and insight to their solution, making liberal use of deep results of other mathematicians in widely differing areas.