Simplify the following text for a Grade 11 native English-speaking person.
Original: MagnÃ s EirÃ ksson ( 22 June 1806 in SkinnalÃ n ( NorÃ ur - Ã ingeyjarsÃ 1\/2 sla ) , Iceland â `` 3 July 1881 in Copenhagen , Denmark ) was an Icelandic theologian and a contemporary critic of SÃ ren Aabye Kierkegaard ( 1813 â `` 1855 ) and Hans Lassen Martensen ( 1808 â `` 1884 ) in Copenhagen .
Simplified: MagnÃ s EirÃ ksson ( born 22 June , 1806 in SkinnalÃ n , Iceland ; died 3 July , 1881 in Copenhagen , Denmark ) was an Icelandic theologian . He lived in Copenhagen at the same time as SÃ ren Kierkegaard ( 1813-1855 ) and Hans Lassen Martensen ( 1808-1884 ) and viewed their opinions on religion and Christianity with a critical eye .