Add spaces: Letterboxwithintegrateddoorcommunication.

Answer: Letterbox with integrated door communication.

Add spaces: Tocotrienolsalsoseemtobeapowerfulwatchdogagainstbothoestrogenpositiveandoestrogennegativebreastcancercells.

Answer: Tocotrienols also seem to be a powerful watchdog against both oestrogen positive and oestrogen negative breast cancer cells.

Add spaces: Duplexapartmentwithaterraceof30sqmandaninteriorsurfaceareaofabout85sqmonthegroundfloor.

Answer:
Duplex apartment with a terrace of 30 sq m and an interior surface area of about 85 sq m on the ground floor.