Complex sentence: The new Minicar design was very well received, and was due to go on sale in early 1952, by July, "owing to supply difficulties" it was still unavailable, and the first production cars were not recorded as being built until October 1952.
Split into simpler sentences: The new Minicar design was very well received, and was due to go on sale in early 1952. By July however, "owing to supply difficulties" it was still unavailable, and the first production cars were not recorded as being built until October 1952.