"complementing them with" is a grammatically correct phrase and can be used in written English.
It is typically used to describe the act of enhancing or completing something by adding or pairing it with another element. Example: The chef prepared the dish by complementing the flavors of the meat with a side of roasted vegetables.
Sharnford C of E Primary School, Sharnford, Leicestershire: update computer suites and wireless networks, complementing them with new tablet computers.
Mr. Chi did so by letting the beautiful golden tiles dominate, complementing them with neutral colors -- "vanilla ice cream is a wonderful base for anything" -- an eye-catching chandelier and an adroit use of space.
Like Bumgarner's, his fastball is topping out at 89 or 90, but he's throwing a ton of curveballs and complementing them with a few sliders and a couple of changeups.
From the results of this study we recommend improving experimental designs of studies investigating physiological responses of corals to climate change by complementing them with colony-specific examinations.
Finally we sketch the elements of a new model coupling both of the first model's aspects and complementing them with machine learning.
Their replication has been restricted to tumors by disrupting viral genes and complementing them with products that are found specifically in tumor cells.
Instead, he complemented them with an optimistic, populist vision of economic success.
Here he imports bottles from around the world, then complements them with European dishes like petatou.
She took laxatives by the handful, and complemented them with sleeping pills so she could try to sleep herself thin.
He used original beats rather than samples to create complex syncopated rhythms and complemented them with quiet background rapping or obscure sounds, such as a whinnying horse.
Now that my common snowdrops (G. nivalis) are finally up, however, it might be interesting to complement them with a few clumps of G. lutescens, a snowdrop with yellow (instead of green) markings.
