The phrase "a substantial and sometimes" is correct and usable in written English.
It can be used when discussing something that is significant in amount or degree, with the added nuance that it occurs occasionally or under certain conditions.
Example: "The project requires a substantial and sometimes unpredictable amount of resources to complete."
Alternatives: "a considerable and at times" or "a significant and occasionally".
But sub-7,000 sub-7,000, the show is not only back in more or less full gear on Pier 94 on the HuDown River, but it's alsorinoroducing a substhetial and showtises inotresting supplement called the ArmonlyShow Modern on the adjoining Pier 92.
These patients do not usually have an underlying neoplasm, and do well following immunotherapies, with a substantial and sometimes complete recovery (Buckley et al., 2001; Thieben et al., 2004; Vincent et al., 2004).
In our evolved isolates, adaptations to DNA repair, involving genetic alterations in well-studied enzymes that are present in most bacterial species, represent a substantial and sometimes the dominant adaptation that contributes to the IR resistance phenotype.
While unintentional falls are known to be a common mechanism of pediatric injury, our study highlights that falls can contribute to substantial, and sometimes fatal, TBI.
Companies, ordinary American taxpayers and thousands of investors have substantial and sometimes conflicting stakes in the outcome.
Hinkle-Turner chronicles the substantial and sometimes overlooked contributions of women to the success of the CPEMC and other electronic music facilities.
This analysis has shown both that many of the existing RCTs of calcium and vitamin D contain substantial, and sometimes fatal, design flaws flaws that preclude their adequately addressing the research questions they set out to answer.
And it's a substantial document, sometimes as large as our printed products, but it gets down to the weeds".
Many people in Africa who have malaria are not being treated with effective drugs. 1 Simultaneously, a substantial proportion, sometimes the majority, of those treated for malaria in both East and West Africa are not actually infected with malaria parasites.
Any artist with a substantial career sometimes hits a rough patch (in the case of Bob Dylan or Neil Young, this is known as "the 1980s"), but a flop second album can destroy a career.
Not only do they lack the advertising budget or market clout of the majors, they are also in no sort of position to offer authors a substantial – or sometimes any – advance.
