Complex sentence: The Sri Lankan President's secretary Lalith Weeratunga alleged that India's intelligence agency RAW had a "big hand in planning and executing terrorist strikes" in Sri Lanka, and "India aided and abetted terrorism, repeatedly violated Sri Lankan sovereignty".
Split into simpler sentences: The Sri Lankan President's secretary Lalith Weeratunga stated that India's intelligence agency RAW had a "big hand in planning and executing terrorist strikes" in Sri Lanka. He alleged that "India aided and abetted terrorism, repeatedly violated Sri Lankan sovereignty".