Complex sentence: In 1995 the minimum thickness of the dielectric was 4 µm, in 2005 some manufacturers could even produce MLCC chips with layer thicknesses of only 1 µm.
Split into simpler sentences: In 1995 the minimum thickness of the dielectric was 4 µm. By 2005 some manufacturers produced MLCC chips with layer thicknesses of 1 µm.