Complex sentence: The silicate glasses are typically formed of phosphosilicate glass (PSG) or borophosphate silicate glass (BPSG), and the boron and/or phosphorus impurity levels used can be adjusted to affect the silicate glass's melting point.
Split into simpler sentences: The silicate glasses are typically formed of phosphosilicate glass (PSG) or borophosphosilicate glass (BPSG). The boron and/or phosphorus impurity levels used can be adjusted to affect the silicate glass's melting point.