"complex and volatile" is a correct phrase and can be used in written English.
It describes something that is difficult to understand and prone to changing or unpredictable behavior. Example: The stock market is a complex and volatile system, affected by numerous factors such as economic conditions, political events, and consumer behavior.
It was no surprise that Mr. Keenlyside gave such a complex and volatile portrayal.
But there's a simpler alternative to cap and trade, which is a complex (and volatile) system.
Venezuela has a complex and volatile economy, with rampant corruption and high rates of unemployment and oil-fuelled inflation.
Israel's party system has traditionally been complex and volatile: splinter groups are commonly formed, and party alliances often change.
Barzani calls Kirkuk the Kurdish Jerusalem, but the city today is a complex and volatile mix of Arabs and Turkmens (ethnic Turks), as well as Kurds.
The world, in her view, is now so complex and volatile that it has become, essentially, a series of "perpetual dilemmas that you have to navigate".
The chemical composition of peppers is quite complex and several volatile and non-volatile substances contribute to their flavor, which is an important sensorial propriety.
In Singapore, a more ambitious variable electronic tolling scheme has reduced rush-hour traffic by up to 20%.Still, London is bigger, more complex and politically volatile.
However, the synthesis of 1,2,4,5-tetrazines 1,2,4,5-tetrazines isvolve volatile reagents.
This work is focused on evaluating kinetic models of complex organic matters hydrolysis and volatile fatty acids degradation in anaerobic digestion process, simulated using SuperPro design software.
During the various stages of asphalt paving mixtures production and placement, as a result of binder heating, a complex mixtures of hydrocarbons and volatile organic compounds (VOCs) is released into the atmosphere.
