Complex sentence: John Francis Wade (1711--16 August 1786) was an English hymnist who is credited with writing and composing the hymn "Adeste Fideles" (which was later translated to "O Come All Ye Faithful").
Split into simpler sentences: John Francis Wade (1711--16 August 1786) was an English hymnist. He is credited with writing and composing the hymn "Adeste Fideles" (also known as "O Come All Ye Faithful").