Complex sentence: Gignon and Guyer were visiting professors at EPF Lausanne 2001--02, visiting professors at ETH Zurich from 2008, and since 2012 hold a joint Professorship for Architecture And Construction at ETH Zurich.
Split into simpler sentences: Gignon and Guyer were visiting professors at EPF Lausanne 2001--02, and visiting professors at ETH Zurich from 2008. Since 2012 they hold a joint Professorship for Architecture And Construction at ETH Zurich.