Complex sentence: The University of Madrid awarded Albert Einstein a Doctor of Science degree Honoris Causa on 28 February 1923; this was the first Doctor of Science degree Honoris Causa that Albert Einstein accepted from a European university.
Split into simpler sentences: The University of Madrid awarded Albert Einstein a Doctor of Science degree Honoris Causa on 28 February 1923. This was the first Doctor of Science degree Honoris Causa that Albert Einstein accepted from a European University.