The phrase "broke into pieces" can be easily replaced by several synonyms that indicate a similar notion. The most common alternatives that can be used instead of this phrase are shattered, fragmented, splintered, and disintegrated. Shattered typically means that something has been broken into several pieces with a loud noise. Fragmented is often used when something has broken into irregular or small pieces. Splintered refers to something that has broken into thin or sharp pieces. Finally, disintegrated can indicate that something has broken apart into dust or small particles. Using different synonyms of "broke into pieces" can add variety to writing and help convey a more vibrant image to the reader.