Complex sentence: The new variant, PZL-104 Wilga mark 2, flew first on 1 August 1963 followed by a short production run which (later was converted to the Wilga C and Wilga mark 3 configurations).
Split into simpler sentences: The new variant, PZL-104 Wilga 2, flew first on 1 August 1963. A short production run followed (later converted to the Wilga C and Wilga 3 configurations).