The phrase "also a major component" is correct and usable in written English.
It can be used when discussing elements or factors that contribute significantly to a larger context or system.
Example: "In addition to its economic impact, tourism is also a major component of the local culture."
Alternatives: "also a key element" or "also an important factor".
Transportation (trucking) is also a major component of the economy.
Lead oxide is also a major component in glass solders or in sealing glasses with low firing temperatures.
It is no accident that the theme driving these ads — Mr. Obama is a failed leader — is also a major component of the Romney campaign's message.
Singer Joe Williams, whose authoritative, blues-influenced vocals can be heard on hit recordings such as "Every Day I Have the Blues" and "Alright, Okay, You Win," was also a major component in the band's success.
Polyphony (music with multiple melodies) is also a major component of Pierre Boulez's "Rituel in memoriam Bruno Maderna" (1974), for which the orchestra was divided into eight groups, each with colourful percussion elements such as tabla (Indian hand drums) and Japanese wood blocks.
It is also a major component of sulfate turpentine, a by-product of the manufacture of paper, and is important as a component of paints and varnishes and as a raw material for the production of a wide variety of products employed in the chemical industry.
Electronics manufacturing has also become a major component of the city's economy.
"We were just scratching the surface of the type of player he could be," Porter says, but the drill also revealed a major component of Nagbe's character.
Water is consumed not only as water itself and as a constituent of other beverages but also as a major component of many foods, particularly fruits and vegetables, which may contain from 85 to 95 percent water.
D-glucuronic acid also is a major component of connective tissue polysaccharides, and D-galacturonic acid and D-mannuronic acid, formed from D-galactose and D-mannose, respectively, are found in several plant sources.
But with presumptive GOP nominee Donald Trump campaigning on a similar I-can-do-this-with-or-without-Congress message, Republicans are finding themselves in the now-familiar position of supporting Trump while also decrying a major component of his platform.
