Complex sentence: As his pace dropped over the years, he added reverse-swing to his armoury, which made him a consistent wicket-taker even in humid weather and on dry and dusty subcontinental pitches, conditions which are known to favour spin bowlers rather than fast bowlers.
Split into simpler sentences: As his pace dropped over the years, he added reverse-swing to his armoury. His consistent deliveries and ability to use various types of swing deliveries effectively made him a consistent wicket-taker even in humid weather and on dry and dusty subcontinental pitches, conditions which are known to favour spin bowlers rather than fast bowlers.