Complex sentence: By the mid 2010s LED filaments were being introduced into the market by several manufacturers--these designs used several LED filament light producers arranged in the same or similar pattern to that found in the wires of a standard incandescent bulb.
Split into simpler sentences: By the mid 2010s, LED filaments were being introduced into the market by several manufacturers. These designs used several LED filament light producers arranged in the same or similar pattern to that found in the wires of a standard incandescent bulb.