The phrase "and therefore decided" is correct and usable in written English.
It can be used to indicate a conclusion or decision that follows logically from previously stated information.
Example: "After reviewing all the evidence, we found the argument compelling, and therefore decided to proceed with the proposal."
Alternatives: "and thus concluded" or "and consequently made the decision".
They knew from the script that the creatures hunt by sound and therefore decided to mimic echolocation clicks.
Parrish said she began experiencing low libido during her second marriage and therefore decided to participate in the clinical trial.
Ma had launched Taobao to defend Alibaba's business-to-consumer business and therefore decided not to charge listing fees, as Eachnet did.
Led by the church leaders, the village community realized that the whole surrounding region was at risk from the epidemic, and therefore decided to seal themselves off from the other surrounding villages.
Mr Hughes said that he felt like a "grass" afterwards and therefore decided not to report Mr Adoboli again in June 2011, when he discovered that his colleague had exceeded the limit once more.
We found that member – the Russian Paralympic Committee – not to be fulfilling its obligations in regards to the IPC anti-doping code and world anti-doping code and therefore decided to take the best course of action for the Paralympic movement.
Instead of deciding the outcome of a criminal trial, the members of the People's House will deliberate and vote on legislation, and therefore decide how to run the country.
Some websites have taken advantage of customers, for example increasing the prices for a flight that they've previously expressed interest in (consumers might worry that the price will go up even further and therefore decide to buy a ticket).
For example, if a student experiences severe anxiety the night before giving a public speech, she may believe that she does not possess the ability to give the speech and, therefore, decide to be sick the next day.
Kollitides is also a trustee of the NRA Foundation to which Freedom Group has made more than $1m in donations and holds a place on the NRA nominating committee, which has considerable sway over who can serve on the organisation's board and therefore decide policy.
This lets us understand transactions individually and therefore decide which one is fraudulent and which one isn't.
