Simplify the following text for a Grade 6 native English-speaking person.
Original: In 1980 , after what he described as an irresistible call of the Lord to preach , Piper became Pastor of Bethlehem Baptist Church in Minneapolis , Minnesota , where he has been ministering ever since .
Simplified: In 1980 , after what he said was something that he could not turn down , he became a preacher . Piper became Pastor of Bethlehem Baptist Church in Minneapolis , Minnesota .