Simplify the following text for a Grade 13 native English-speaking person.
Original: 1902 â `` 1904 : Theodor Heinrich Boveri ( 1862 â `` 1915 ) , a German biologist , made several important contributions to chromosome theory in a series of papers , finally stating in 1904 that he had seen the link between chromosomes and Mendel 's results in 1902 ( although this is not documented in his publications ) .
Simplified: 1902 â `` 1904 : Theodor Boveri ( 1862 â `` 1915 ) , a German biologist , in a series of papers , drew attention to the correspondence between the behavior of chromosomes and the results obtained by Mendel .