Lekh Lekha: Sequencing Avraham's Prophecies

In the Covenant Between the Parts, God tells Avraham that his descendants will be oppressed and enslaved in a foreign land for 400 years. In Shemot, however, the Torah relates that Bnei Yisrael were in Egypt for 430 years! How can we account for this discrepancy? Rashi and other commentators offer explanations, and also provide different readings of the sequencing of Avraham's journeys and prophecies.