Complex sentence: However, when design was delayed due to financial problems in the company, the contract was allowed to lapse with no aircraft built, likely because USAAC was moving towards larger fighters and had lost interest in the project.
Split into simpler sentences: However, when design was delayed due to financial problems in the company, the contract was allowed to lapse. No production aircraft was ever built because the USAAC was moving towards larger fighters and had lost interest in the project.