See the bold:
https://join.substack.com/p/experimentation
the projects were supposed to help modernize Sri Lanka and generate tax revenue, but the projects failed.
I can't reach my interviewee for clarification, but my guess is that "to help" is not supposed to modify "generate tax revenue", which means the bold below would be a superior ordering:
the projects were supposed to generate tax revenue and help modernize Sri Lanka, but the projects failed.