I was searching for some examples of "To Make progress", I mean I wanted to know how to use "To Make Progress" in a sentence. I ended up finding a website with some examples. But I faced the below sentence:
This preoccupation has tended to make progress on other issues difficult.
I actually didn't realize what this sentence is saying! I also don't know why it is using "has tended" because I didn't find any sample using "have" or "has" before the verb tend in LongMan Dictioanary!
Can I say: This preoccupation has usually made making progress on other issues difficult instead of the preceeding one?
Would anybody explain it to me?