Complex sentence: In Birmingham, "Gamgee" became the colloquial name for cotton wool, which possibly, led to a character name (Sam Gamgee) in J.R.R. Tolkien's "The Lord of the Rings".
Split into simpler sentences: In Birmingham, "Gamgee" became the colloquial name for cotton wool. This, possibly, led to a character name (Sam Gamgee) in J.R.R. Tolkien's book "The Lord of the Rings".