Complex sentence: In December 1931, Pengam Airport flooded as a result of high tides and 2 months of very bad weather this put a halt to the flying and it wasn't until April 1932 before flying could resume.
Split into simpler sentences: In December 1931, Pengam Airport flooded as a result of high tides and 2 months of very bad weather. This put a halt to the flying and it wasn't until April 1932 that flying could resume.