Complex sentence: One of these towns (Nashobah) was located on the land around Fort Pond from Nagog Pond around both sides south to Fort Pond Hill, the eastern part of which straddles the town line between Acton and Littleton.
Split into simpler sentences: One of these towns (Nashobah) was located on the land around Fort Pond from Nagog Pond around both sides south to Fort Pond Hill. The eastern part of Nashobah straddles the town line between Acton and Littleton.