The phrase "amalgamated to" is correct and usable in written English.
It can be used when describing the process of combining or merging different entities or elements into a single unit.
Example: "The two companies were amalgamated to form a stronger organization that could compete more effectively in the market."
Alternatives: "merged with" or "combined with".
Mahogany Opera and the Opera Group have amalgamated to form the Mahogany Opera Group.
In 1973 the four Muslim parties were amalgamated to form the United Development Party (Partai Persatuan Pembangunan; PPP), and the five non-Muslim parties were amalgamated to form the Indonesian Democratic Party (Partai Demokrasi Indonesia; PDI).
Through the Ordinance of 1787 the ceded lands were amalgamated to create the Northwest Territory, which included present-day Indiana.
The two original classes were increased to four, and some specialized branches were amalgamated to become the Scientific Civil Service.
In 1963 the five cities of Moji, Kokura, Tobata, Yahata, and Wakamatsu were amalgamated to form Kita-Kyūshū, the largest city and industrial complex in Kyushu.
In 2001 Huaiyin and several other surrounding administrative entities were amalgamated to create a new city under the name Huai'an; Huaiyin became a district of the new municipality.
Robert Stephenson suggested that a number of railways and canals should amalgamate, to reduce competition when bills were presented to Parliament.
Internal Drainage Boards have tended to amalgamate to cover larger areas, and the Romney Marshes Area IDB formed from the Romney Marsh Levels, the Walland Marsh, the Denge and Southbrooks, the Rother and the Pett IDBs.
A third regional system was applied after the 10th century, in which kuni were amalgamated according to their distance from Kyōto.
Herding is still a separate profession, but amalgamated partially to nature-based tourism and park management activities.
