Complex sentence: Research funding from the EEC allowed him to experiment with species of Inga, that would be used as hedges and pruned when large enough to provide a mulch in which bean and corn seeds could be planted.
Split into simpler sentences: Research funding from the EEC allowed him to experiment with species of Inga. The Inga would be used as hedges and pruned when large enough to provide a mulch in which bean and corn seeds could be planted.