Complex sentence: They are designed to wrest air superiority from the enemy in hostile territory, and thus have greater range than tactical fighters or interceptors, typically have two engines and often carry a larger number of air-to-air missiles than their smaller brethren.
Split into simpler sentences: They are designed to wrest air superiority from the enemy in hostile territory, and thus usually have greater range than tactical fighters or interceptors. They therefore typically have two engines, and often carry a larger number of air-to-air missiles than their smaller brethren.