Fire the Yellow Bird to the right structure. This will pop the pigs and explode the two TNTs with the help of some blocks. Then, shoot the Blue Bird to the left structure. This will clear the left of the left structure. Shoot the White Bird to the first structure and drop the egg bomb between the boulders and the structure. The boulders will roll down and pop the pig hiding next to a small square block slightly below the slingshot.
Use this strategy if you want more score. Shoot the Yellow Bird to the first structure, destroy as much blocks there as possible. Next, shoot the Blue Bird to the first structure again and destroy as much ice blocks as possible and pop all the remaining pigs there. Then, shoot the White Bird toward the space between the first and second structure. When she's above the first glass tent, drop the egg bomb next to it and close to the ground. She should propel to the second structure, make it fall to the TNTs and make it explode. The structure will pop the pigs there and the boulders will clear all the tents. This causes a lot of destruction.