Complex sentence: He studied philosophy (and computer science as a minor) at the University of Helsinki and received his Ph.D. in philosophy from the same university in 1994 for a thesis on philosophy of religion on "The challenge of Bertrand Russell" as the youngest Ph.D. in Finland.
Split into simpler sentences: He studied philosophy (and computer science as a minor) at the University of Helsinki. In 1994, with his thesis on the philosophy of religion, "The challenge of Bertrand Russell", he received his Ph.D. in philosophy from the same university, thus becoming the youngest Ph.D. in Finland.