The part of the sentence "amassed a large collection" is correct and usable in written English.
You could use it to describe something someone has done in the past or in the present. For example, "The avid stamp collector amassed a large collection of unique stamps from around the world over the past two decades."
The Vanlaetems had amassed a large collection of one-of-a-kind furnishings and antiques that they wanted to display.
By then she had amassed a large collection of dresses, all as colorful and patterned as butterfly wings.
Soon we had amassed a large collection of the restaurant's wet naps, which my brother called Hamdi wipes.
Mr. Bulkley was a life long collector and amassed a large collection of 19th century letterheads, advertising trade cards, and stamps.
Mr. Tomkinson, who took over his family taxi company in Manchester in the early 1970s, has amassed a large collection of antique cabs from around the world.
Mohammed Merah, whose only official income came from state welfare payments, amassed a large collection of firearms, including several automatic weapons, which are rare in France.
The sometime narrator, Alby Starvation, is a down-on-his-luck amphetamine runner whose main triumphs in life thus far have been to amass a large collection of comics and to cure himself of the ailments brought on by a serious milk allergy.
As the younger brother of the Emperor Ferdinand III and cousin of Philip IV of Spain, the Archduke had the wherewithal to amass a large collection of paintings and antiquities.
Over his lifetime, he amassed a large art collection, including numerous works by Rubens, some by Anthony van Dyck, and others by Dutch and Flemish contemporaries and Old Masters.
His great-grandfather Nathan Wildenstein was an Alsace cloth merchant who amassed a large art collection that was continued by his son Georges, a patron of Pablo Picasso, Salvador Dalí and Max Ernst.
They amassed a large art collection, including a series of gargantuan paintings by Rubens that are displayed at the John and Mable Ringling Museum of Art (5401 Bay Shore Road, 941-359-5700 941-359-5700 941-359-5700e 66-acre bayside estate www.ringlingintered.org
