Complex sentence: After the Hermits tour, the Who recorded their next single, "I Can See for Miles", which Townshend had written in 1966 but had avoided recording until he was sure it could be produced well.
Split into simpler sentences: After the Hermits tour, the Who finished work on their next single, "I Can See for Miles". Townshend wrote the song in 1966, but avoided recording it until he was sure that it could be produced well.