What is common to all these types of services is that the process of their delivery is subject to our internal control of quality.
I am not sure about the sentence structure indicated above. I wonder whether this structure is unusual for native speakers of English? Google does not clear up this question.
Here I am speaking about the common feature of the services.
Best Answer
It reads like corporate-speak [all it really means is 'we don't screw up'] but grammatically it's absolutely fine.