Complex sentence: Although Tolkien never created enough vocabularies to make Quenya a conversational language, fans have been writing poetry and prose in Quenya since the 1960s, which has required conjecture and the need to devise new words, in effect developing a kind of "neo-Quenya" language.
Split into simpler sentences: Although Tolkien never created enough vocabulary to make it possible to converse in Quenya, fans have been writing poetry and prose in Quenya since the 1960s. This has required conjecture and the need to devise new words, in effect developing a kind of "neo-Quenya" language.