There is a positive correlation between agglutinative morphology and simple syllable structure (or at any rate short syllables), on the one hand and flective (and possibly also no) morphology and more complex syllable structure (or at any rate longer syllables) on the other.
Standardized
IF morphology is agglutinative, THEN syllabic structure is simple (syllables are short), and vice versa. IF morphology is flexive, THEN syllabic structure is complex (syllables are long), and vice versa.