Complex sentence: Pisa hosts the University of Pisa, especially renowned in the fields of Physics, Mathematics, Engineering and Computer Science, the and the, the Italian academic élite institutions, mostly for research and the education of graduate students.
Split into simpler sentences: Pisa hosts the University of Pisa, especially renowned in the fields of Physics, Mathematics, Engineering and Computer Science. The and the, the Italian academic élite institutions are noted mostly for research and the education of graduate students.