"retain independence" is a correct and usable phrase in written English.
You can use it when referring to someone or something striving to remain independent or autonomous. For example, "The small nation fought to retain its independence."
"It is important for us to retain independence.
Ahmed claims that he avoided selling out to one of the major advertising groups to retain independence.
This plan called for each state to retain independence of action in most areas, but military and economic resources were to be integrated.
According to Omikron's Mehran Khalili, such solidarity-focused projects often consciously avoid professionalising their relations with volunteers or applying for grant funding in a bid to retain independence.
The company, which had secured its initial funding from a fan-driven Kickstarter campaign, had to reassure supporters that it was still focused on creating a games-focused VR experience, and would retain independence from Facebook.
Fourth, the funding agencies, though "responsible to the president and Congress," would retain "independence and freedom" with regard to the research.
Having emerged as independent entities during the collapse of Germany and Russia, the Baltic states retained independence as long as both of these powers remained weak or antagonistic.
Yet Jason, wise in the way of stories, retains independence and self-awareness.
Rosset retained independence until 1985, when he sold out to George Weidenfeld and Ann Getty, on the understanding that he would remain in charge.
Despite growing prosperity and success in retaining independence, 4th-century Egypt was characterized by continual internal struggle for the throne.
"I'm delighted that Kojima-san, albeit retaining independence, has found a home with Sony - I think he's been very happy with the experience so far.
