Complex sentence: Though the flag itself was a simple, off-the shelf nylon flag from the government supply catalog, altered only by sewing the top hem, its packaging, tolerance of environmental conditions, and means of deployment presented minor engineering challenges.
Split into simpler sentences: Though the flag itself was a simple, off-the shelf nylon flag from the government supply catalog, altered only by sewing the top hem. Its packaging, tolerance of environmental conditions, and means of deployment presented minor engineering challenges.