Complex sentence: Like all the gospels John is anonymous, but Church tradition identified its author as John the evangelist, one of the Twelve (Jesus' innermost circle), but this attribution is rejected by the majority of modern scholars.
Split into simpler sentences: Like all the gospels John is anonymous, but Church tradition identified its author as John the evangelist, one of the Twelve (Jesus' innermost circle). This attribution is rejected by the majority of modern scholars.