Complex sentence: The Spanish singular of "tamales" is "tamal"; the English word "tamale" was likely created by English speakers who did not speak Spanish and assumed that removing the "s" alone would yield the singular.
Split into simpler sentences: The Spanish singular of "tamales" is "tamal". The English word "tamale" was likely created by English speakers who did not speak Spanish and assumed that removing the "s" alone would yield the singular.