"it will simultaneously" is correct and usable in written English.
You can use it to describe two or more actions that happen at the same time. For example, "The parade will begin at 10 a.m. and it will simultaneously mark the start of a new era for the town."
It will simultaneously increase profits, decrease consumer prices, prevent excessive wage rises and support increases in wages.
That will enable Labour to argue that government economic strategy since 2010 has made things worse, though it will simultaneously cramp any hopes of extra Labour spending after 2015.
The tax issue is fundamental: it will simultaneously put pressure on the industry to burn less fuel and motivate it to investigate technological and operational efficiency measures with greater urgency - it will encourage the industry to increase the number of passengers on flights, for example, so fewer flights are scheduled".
Although this can be done practically, it will simultaneously increase the point to point transmission delays in the network, which may not be desirable.
The only glimmer of hope is that North Korea also announced that along with the nuclear weapons work it will simultaneously be pushing forward economic development.
But if the city can't even figure out a housing strategy for the middle-class, it's hard to see how it will simultaneously generate the political will to house lower-income communities and the homeless.
The buzz for the game at the LA Convention Center was palpable, and the line to get your hands on it in its Wii U guise, as it'll simultaneously be released on Nintendo's next-gen console, provisionally (at least) called the NX, next year was incalculably epic (organizers had to close the line several times).
The buzz for the game at the LA Convention Centre was palpable, and the queue to get your hands on it – in its Wii U guise, as it'll simultaneously be released on Nintendo's next-gen console, provisionally (at least) called the NX, next year – was incalculably epic (organisers had to close the line several times).
Aside from looking creepy as all hell, this Mr. Clock Radio serves an important purpose: it'll simultaneously wake you up and send you into cardiac arrest.
It will broadcast simultaneously on two channels, in English and French.
It will be simultaneously published around the world in book, digital and audio formats and in a number of languages.
