Have I parsed this correctly? 在这一重大的历史时点，和讯网对著名经济学家张维迎就改革的发展问题进行了一次非常深入的访谈。
在这一重大的历史时点，和讯网/对(著名经济学家)张维迎(就改革的发展问题)进行了(一次非常深入的)访谈。

the main structure is 和讯网对张维迎进行了访谈

So the correct translation that reflects this structure should be

At this important historical point, Hexun.com has conducted a very in-depth discussion (or interview) with the renowned economist ZHANG Weiyin on the question (or problem) of future directions of reform.