The phrase "and therefore sometimes" is correct and usable in written English.
It can be used to indicate a conclusion or result that occurs occasionally based on a preceding statement or condition.
Example: "The weather can be unpredictable, and therefore sometimes we need to adjust our plans accordingly."
Alternatives: "and thus at times" or "and as a result occasionally".
Gross enrolment figures include students of all ages, including those who are repeating or are starting school early, and therefore sometimes exceed 100%.
One is that teachers are not confident to teach the topic and therefore sometimes tell the class just to read the section themselves.
If you ask me, I would, for once, like to ask you something, and it is this: are you quite poncy and therefore sometimes shop at Waitrose?
Study results showed that Lilly women were more likely to focus on doing the work itself than on networking, and therefore sometimes missed opportunities for promotions despite strong performance.
Hence that which not always is not will sometimes be and sometimes not be; and it is clear that this is true also of that which cannot always be but sometimes is and therefore sometimes is not.
Like his Republican predecessors, he promoted well-known legal academics who had been allies, and advisers, of the Federalist Society, although they came from different wings of the conservative legal movement and therefore sometimes disagreed about crucial agenda items.
On the other hand, ICER cannot require manufacturer input (and must therefore sometimes rely solely on its own data collection and modeling for certain assessments), does not actively involve patients or the public (though public comment periods following draft analyses have become commonplace), and offers only limited transparency of its models.
Arguably, acceptance can be seen as closer to self-immersion than self-distancing, since it involves a 'full and open' embrace and observation rather than a distanced reanalysis of internal phenomena, and might therefore sometimes be counter-productive as an emotion regulation strategy.
They recruited students mainly from the urban intelligentsia and were therefore sometimes criticized by adherents of egalitarian principles in education.
Astronomers do not receive strong training in statistical methodology and are therefore sometimes prone to analyze data in ways that are discouraged by modern statisticians.
I like the snapshot we've got of politics here – that even though they may politically be opposed, they are professionals in a field still and will therefore sometimes share information.
