Complex sentence: He received his doctorate at the Hebrew University Institute of Archaeology in 1987 and in the following year he was awarded a Rothschild fellowship, before returning to Ramat Hanadiv in 1989, when he also started work on excavations at Tiberias.
Split into simpler sentences: He received his doctorate at the Hebrew University Institute of Archaeology in 1987 and the following year he was awarded a Rothschild fellowship. He returned to Ramat Hanadiv in 1989, the year he also started work on excavations at Tiberias.