Complex sentence: The verbal suffix "-s" indicates a combination of present tense with both third person and singularity of the associated subject, and the verbal suffix "-ed", used in a verb with no auxiliary verb, conveys both non-progressive aspect and past tense.
Split into simpler sentences: The verbal suffix "-s" indicates a combination of present tense with both third person and singularity of the associated subject. And the verbal suffix "-ed", used in a verb with no auxiliary verb, conveys both non-progressive aspect and past tense.