The phrase "are now complementing" is correct and usable in written English.
It can be used to indicate that something is currently enhancing or completing another thing.
Example: "The new features are now complementing the existing software, making it more user-friendly."
Alternatives: "are currently enhancing" or "are now adding to".
The early 20th-century space's original wooden beams and brick walls are now complemented by slate floors, Wegner chairs and porcelain tableware by the artist Wang Hai.
The vague, secondhand ideas about the blight of the suburbs that sloshed around "American Beauty and Revolutionary Roadare are now complemented by an equally incoherent set of notions about the open road, the pioneer spirit, the idealism of youth.
The old fashioned quads at Amherst or Grinnell are now complemented by advanced communication technology.
The mild mdx mice are now complemented by numerous background and mutation variants that can better mimic affected humans.
Decades of biochemical analyses have produced the basis for our understanding of plant primary metabolism and are now complemented by genomic, proteomic and metabolomic approaches.
These findings are now complemented by our collection of Ae. albopictus mosquitoes from Cancun in Quintana Roo State, which with Yucatan and Campeche States compose the Yucatan Peninsula.
These findings are now complemented with the result of the present study, firstly using a mouse model, indicating that innate high levels of trait anxiety and depression-like behavior may lead to and/or share a common genetic basis with disturbed circadian rhythms.
It was also another impressive, gritty display by Prior who once again displayed the responsibility which is now complementing his undoubted range of attacking shots in the middle order.
The stunning view of the New York skyline is now complemented by an impressive menu of contemporary American cuisine.
The veteran core of Chauncey Billups, Richard Hamilton, Tayshaun Prince and Rasheed Wallace is now complemented by a youthful bench featuring Jason Maxiell, Jarvis Hayes and the rookies Rodney Stuckey and Arron Afflalo.
