The phrase "also a major part" is correct and usable in written English.
It can be used to indicate that something is an important component in addition to other elements being discussed.
Example: "In addition to the financial aspects, marketing strategies are also a major part of our business plan."
Alternatives: "also a significant element" or "additionally a key component".
Retailers are also a major part of the commercial real estate and school tax base.
Guiding parents, who have often invested large amounts of time and money in their children's athletics, is also a major part of Dr. Katz's job.
And through the television broadcast, which takes place roughly three weeks later, the Honors are also a major part of the Kennedy Center's national profile.
There are a lot of data points that go into measuring yield in any given year, but this is also a major part of the challenge.
While web servers are at the core of this trend, load balancing, caching, media streaming and security are also a major part of delivering applications.
HE reform was also a major part of the government's 2017 Industrial Strategy, which announced investment 'to test the use of AI and innovative education technology' in university courses to develop 'digital skills' (HM Government, 2017: 41).
In several other European countries such as Denmark, Norway, Spain, Sweden, and the United Kingdom and also in Australia, Canada, and the USA, Chinese children also form a major part of the adoptees [ 1, 20].
But did you know that the majority of dog owners say their four-legged friend has also played a major part in helping them talk to strangers, make new friends and even find true love?
As Tony Blair famously pointed out, tackling the causes of crime also plays a major part.
He also played a major part in discovering the role nicotine played in smoking.
While that takes care of class, regions also play a major part in the election game.
