The phrase "and simultaneously developing a" is correct and usable in written English.
It can be used when describing two actions occurring at the same time, particularly in contexts involving projects, processes, or skills.
Example: "The team is working on the new software update and simultaneously developing a user-friendly interface."
Alternatives: "while also creating a" or "and concurrently building a".
He overcame the problem in the following year and simultaneously developed a number of attachments, for example the cautery and warm air blower.
By the early nineteen-twenties, the German economy, damaged by defeat, had become crippled by the attempt to pay the reparations demanded by the victorious European Allies and simultaneously develop a social-welfare state.
The group filed a patent in December 2009 and simultaneously developed a business plan for what later became Identizyme Defense Technologies.
They currently live and work in NYC as architects and simultaneously develop a research about the relationships between space and sound through the design and construction of inhabitable sound instruments and installations.
Unlike traditional lecture-style pedagogy, this course is completely project-driven with the goal of fostering 21st Century skills such as creativity and innovation, critical thinking, and self-direction, while simultaneously developing a student's media literacy and Spanish language skills.
He curated sprawling shows, threw lavish parties, and even briefly worked as the reviews editor for Artforum, while simultaneously developing a reputation as a flake who often didn't or couldn't pay what he owed.
But he did not move in, as he was simultaneously developing a Florida resort.
(Mr. Mizrahi is simultaneously developing a magazine-format television show for the USA Network that focuses on style).
Over the past few years, she's been getting unprecedented public nagging about retirement while simultaneously developing a massive popular fan base.
To be fair, most of the companies talking up tiny EVs are similarly hedging their bets, simultaneously developing a range of hybrid options.
