Complex sentence: Sir Waller mustered his men in Farnham park near 10:30 p.m. on the evening of 12 December, and at around midnight 5000 of Waller's men began to march west from Farnham toward Basing House.
Split into simpler sentences: Sir Waller mustered his men in Farnham Park near 10:30 p.m. on the evening of 12 December. At around midnight, 5000 of Waller's men began to march west from Farnham toward Basing House.