Complex sentence: They initially played at Fulham Fields before a move to Craven Cottage in 1896; the club played their first professional match in December 1898 and made their FA Cup debut in the 1902--1903 season.
Split into simpler sentences: They initially played at Fulham Fields before a move to Craven Cottage in 1896. They played their first professional match in December 1898 and made their FA Cup debut in the 1902--1903 season.