Complex sentence: The name inflaton is not missing an'i' in the last syllable, it is spelt that way in order to follow the standard convention of field names, such as photon field and gluon field, which end with "on".
Split into simpler sentences: The name inflaton is not missing an'i' in the last syllable. It is spelt that way in order to follow the convention of field names, such as photon field and gluon field, which end with "on".