Complex sentence: Swindin's tinkering with the Arsenal attacking line-up meant the versatile Henderson was unable to hold down any particular position in the side, and midway through the 1961--62 season Henderson was transferred to Fulham for £15,000.
Split into simpler sentences: Swindin's tinkering with the Arsenal attacking line-up meant the versatile Henderson was unable to assure any particular position in the side. As this was so, midway through the 1961--62 season Henderson was transferred to Fulham for £15,000.