Complex sentence: Originally 60 JAS 39Cs were to be retrofitted to the E level by 2023, but Sweden's revised acquisition strategy, adopted in June 2014, calls for all Gripen E aircraft on order to be new-built.
Split into simpler sentences: Originally 60 JAS 39Cs were to be retrofitted to the E level by 2023. But Sweden's revised acquisition strategy adopted in June 2014, calls for all Gripen E aircraft on order to be new-built.