I'd encourage you to continue to read the chapters noting the distinctions between the different forms of dispensationalism. It is probably the best book at defining the differences. And yes, it is a bit difficult to grasp but it is certainly worthwhile.
It is the Church and its eschatology that define dispensationalism.
Dispensationalism is nonsupersessionist—dispensationalists do not believe that the Church replaced Israel; this distinction emphasizes a future hope for Israel.
Progressive dispensationalists (PD) also hold to a distinction between the Church and Israel, but there’s a higher emphasis on soteriological unity,
...on how both are part of God’s overall kingdom program,
...on how the church is not simply a parenthesis,
...hence the term “progressive”– there is a progress which occurs in God’s plan .
In particular, PD utilizes
an already/not yet view of eschatology (other prominent dispensationalists, [Walvoord and Pentecost in particular] rejected this idea).
For the progressive dispensationalist, the hermeneutical key to Revelation (and for that matter, the New Testament in general) is the “already/not yet” eschatological tension (see the introduction of this book for the background of such a concept). That is to say, with the first coming of Jesus Christ the age to come already dawned, but it is not yet complete; it awaits the Parousia for its consummation.
C. Marvin Pate, “A Progressive Dispensationalist View of Revelation,” in Four Views on the Book of Revelation, ed. Stanley N. Gundry and C. Marvin Pate, Zondervan Counterpoints Collection (Grand Rapids, MI: Zondervan, 1998), 135–136.
This distinction alters the hermeneutical understanding of many NT verses (particularly those dealing with Christ and his kingdom), and allows a more natural, literal understanding of Scripture.
The more I study the bible, the more I tend to lean towards progressive dispensationalism.
Rob