"simply to conclude" is an acceptable phrase to use in written English.
You use it at the end of a statement to summarize or wind up your argument. For example: In conclusion, I believe that the evidence supports the argument that this policy should be implemented. Simply to conclude, it is clear that this policy is necessary and beneficial for everyone involved.
Mr. Jones said communities all across the country had routinely examined barriers to fair housing, and he called it unacceptable for Westchester simply to conclude that it had none.
"I've noticed it in my text messages and online chats," Crair wrote, "where people use the period not simply to conclude a sentence, but to announce 'I am not happy about the sentence I just concluded.'".
If there are several possible causes, and there usually are, it is not enough simply to conclude that a case is thought to be "confounded;" they nearly all are.
In the present case, I am simply unable to conclude that the prosecution met its burden of establishing Anita Isaacs' unavailability.
For other species we simply have to conclude that smiling is tough if you have no lips.
While fertility can indicate social and economic health, it's simply wrong to conclude that economic growth drops in parallel with fertility.
To begin with, it is simply unreasonable to conclude that five cases of medical complications are cause for national panic and condemnation of all practitioners of a given medical discipline.
With surveys of manufacturers continuing to point to falling production, it's simply too soon to conclude that April's data mark a turning point in the industrial sector's decline".
… [A]t the end of the day we are simply less likely to conclude that our friend acted disreputably, or that he is a bad person, than we would in the case of a nonfriend" (Stroud 2006, pp. 505 6).
It is simply not valid to conclude the hormones are acting via the same mechanism in males and females just because a similar effect on blood pressure is observed in both sexes.
But it is also too mechanistic to conclude simply that the ideal is halfway between these extremes.
