Complex sentence: Although it is inexpensive to recycle lead from other sources into homemade dive weights, pure lead melts at and vaporizes at, and its fumes will form oxides in the air and turn into dust can settle on nearby surfaces.
Split into simpler sentences: Although it is inexpensive to recycle lead from other sources into homemade dive weights, pure lead melts at and releases fumes at. The fumes will form oxides in the air and settle as dust on nearby surfaces.