Complex sentence: In mathematics, the n! conjecture is a conjecture about the Macdonald polynomials made by A. M. Garsia and proved by M. Haiman, that implies Macdonald's positivity conjecture about his polynomials.
Split into simpler sentences: In mathematics, the n! conjecture is a conjecture about the Macdonald polynomials. It implies Macdonald's positivity conjecture about his polynomials.