Complex sentence: The Power brand is the best known Egyptian brand in Egypt in 1998, Power overtook Egyptian rival ColdAir as the Egypt's leading AC brand and became part of the top twenty African brands overall.
Split into simpler sentences: The Power brand is the best known Egyptian brand in Egypt. In 1998, Power overtook Egyptian rival ColdAir as the Egypt's leading air conditioning brand and became part of the top 20 African brands overall.