Simplify the following text for a Grade 9 native English-speaking person.
Original: His writings show that DÃ 1\/4 rer was highly sympathetic to Martin Luther , and he may have been influential in the City Council declaring for Luther in 1525 .
Simplified: DÃ 1\/4 rer was a Roman Catholic , although his writings suggest that he may have been sympathetic to Martin Luther 's ideas .