Complex sentence: Noticeably similar surnames include Cock, Cocks, Coxe, Coxen and Coxon, yet there is no evidence beyond similar spellings and phonetics that these surnames are related.
Split into simpler sentences: Noticeably similar surnames include Cock, Cocks, Coxe, Coxen and Coxon. There is no evidence beyond similar spellings and phonetics that these surnames are related.