Complex sentence: However, because of its erratic and sometimes slow movement, and the prolonged torrential rainfall associated with it, massive damage occurred with the worst hit areas were east Malaita Province and the Guadalcanal Plains area.
Split into simpler sentences: However, because of its erratic and sometimes slow movement, and the prolonged torrential rainfall associated with it, massive damage occurred. The worst hit areas were east Malaita Province and the Guadalcanal Plains area.