Complex sentence: Seabrook began reporting for NPR in 2001, after working on "Anthem", an NPR music program, and working in the Mexico Bureau and provided fill-in coverage of Mexico and Central America.
Split into simpler sentences: Seabrook began reporting for NPR in 2001, after serving in a variety of editorial and production positions. From there she moved to NPR's Mexico Bureau and provided fill-in coverage of Mexico and Central America.