Complex sentence: The first starts at 0.00 from Port Said, and anchors in the Great Bitter Lake to let the northbound pass; the second starts at 07.00 and anchors in the western Ballah by-pass to let the northbound convoy pass.
Split into simpler sentences: The first starts at 0.00 h from Port Said, and anchors in the Great Bitter Lake to let the Northbound pass. The second Southbound convoy starts at 07.00 h from Port Said and anchors in the western Ballah by-pass to let the Northbound convoy pass.