Complex sentence: She is largely the forgotten yet the most successful captain of the England National side to this date, becoming and remaining the longest serving captain from May 1974 to September 1985 before being overtaken by Faye White in 2011.
Split into simpler sentences: She is largely the forgotten yet the most successful captain of the England National side to this date. She remained the longest serving for a period of 26 years before being overtaken by Faye White in 2011.