Complex sentence: The Japanese Occupation brought back the divisions under the National Museum of the Philippines as provided by Philippine Republic Executive Order No.94, but the museum lost a large part of its collection during the Liberation of Manila when the Legislative Building was destroyed by American artillery.
Split into simpler sentences: The Japanese Occupation brought back the divisions under the National Museum of the Philippines as provided by Philippine Republic Executive Order No.94. But the museum will lost a large part of its collection during the liberation of Manila when the Legislative Building was destroyed by American artillery.