Complex sentence: Millwall Rovers' first fixture was on 3 October 1885 against Fillebrook, a team that played in Leytonstone, however the newly-formed team were beaten 5--0.
Split into simpler sentences: Millwall Rovers' first fixture was on 3 October 1885 against Fillebrook, a team that played in Leytonstone. The newly-formed team were well beaten 5--0.