Complex sentence: Crosses, also known as four-way fittings or cross branch lines, have one inlet and three outlets (or vice versa), and often have solvent-welded socket or female-threaded ends.
Split into simpler sentences: Crosses, also known as four-way fittings, cross branch lines. A cross has one inlet and three outlets (or vice versa), and often have solvent-welded socket or female-threaded ends.