Complex sentence: The prototype of the initial Wilga 1 variant was first flown on April 24 1962 and was engined with an existing Polish 220 hp horizontally opposed engine the PZL WN-6RB.
Split into simpler sentences: The prototype of the initial Wilga 1 variant was first flown on April 24 1962. It used a Polish 220 hp horizontally opposed engine PZL WN-6RB.