The phrase "a combination of years" is correct and usable in written English.
It can be used when referring to a specific period that encompasses multiple years or when discussing the collective impact or significance of those years.
Example: "The project was a culmination of a combination of years of research and development."
Alternatives: "a span of years" or "a series of years".
In the last year – more than any other period during my time as a doctor – I've seen a combination of years of underfunding and an unstoppable rise in demand really start to bite.
She told the Guardian: "This referendum has revealed that there are a lot of people [who] feel they don't have a voice, that this country is not working for them and they have faced a combination of years of austerity and a rapid pace of change in their community they didn't vote for.
It's a combination of years working with specific types of design, and growing and evolving your artwork and your imagery.
DALYs are a combination of years lived with disability (YLD) and years of life lost due to premature mortality (YLL) (Formula 4, Table 1).
"The progress we made on the print advertising front in October and November was not sustained in December due to a combination of difficult year-over-year comparisons and advertiser caution about the economy and consumer spending".
Cosby faces up to 30 years in prison and $75,000 in fines — a combination of 10 years in prison on each count, which he will likely serve concurrently, according to the Associated Press.
A bond investor with a duration target of around 7 (corresponding to the duration of a 10-year corporate bond) earned up to 50 extra basis points for buying a combination of 5-year and 30-year paper.
The DALY is a combination of the years of life lost (YLL) due to premature death and the years of life lived with a disability (YLD).
A combination of many years of biochemical and genetic studies has elucidated several parallel signal transduction pathways used by EGF and its receptor.
Mean adherence to food and micronutrient supplements by a combination of maternal years of schooling and randomization groups, interactions between food groups and micronutrient groups, between food groups and maternal education groups and between micronutrient groups and maternal education groups were analyzed by univariate analysis of variance.
The likely explanation for the evidence of stabilization in the incidence of RRT in Croatia is a combination of 10 years comprehensive RRT registry, unrestricted (unchanged) access to the RRT, and the decreasing trend in cardiovascular mortality (by 27.5%) during the same decade [ 17].
