Complex sentence: At the end of July, Weeks went forward with the purchase, his crew conducted minor repairs, and the plane, registration number N1944A was flown back to the United States by Weeks and his crew.
Split into simpler sentences: At the end of July, Weeks went forward with the purchase. His crew conducted minor repairs and the plane, registration number N1944A, was flown back to the United States by Weeks and his crew.