Complex sentence: Northcote Park, the Cougars, won their first premiership in the Metropolitan League in 1957 then transferred to the P.H.F.L in 1973 where the club won three consecutive premierships in 1977,1978,1979.
Split into simpler sentences: Northcote Park, nicknamed the Cougars, won their first premiership in the Metropolitan League in 1957. The Club moved on to the P.H.F.L in 1973 where it won three consecutive premierships in 1977,1978,1979.