Complex sentence: Their relationship produces first a failure and then a string of successes, and their repartée remains sharp and witty as their unrequited interest in each other gathers energy over a nine-year period, until some resolution finally is in sight.
Split into simpler sentences: Their relationship produces first a failure and then a string of successes. Their repartée remains sharp and witty as their unrequited interest in each other gathers energy over a nine-year period, until some resolution finally is in sight.