Original sentence:
She once tried to draw me a Darth Vader, but it ended up looking like some weird mushroom-shaped robot.
Look at the following sentences and find what has changed. What is the effect of the change:
1. She once tried to draw me a Darth Vader but it ended up looking like some weird mushroom-shaped robot.
2. She once tried to draw me a Darth Vader, it ended up looking like some weird mushroom-shaped robot.
3. She once try to draw me a Darth Vader, but it ended up looking like some weird mushroom-shaped robot.