Complex sentence: This liquid mixture is poured just covering the bottom onto a specially made flat pan with holes kind of a colander meets a flat sheet pan in which it is steamed from the bottom up to produce the square rice noodle sheets.
Split into simpler sentences: This liquid mixture is poured into a specially made flat pan with holes (similar to a flat colander). The noodle mixture is steamed in the pan from the bottom up to produce the square rice noodle sheets.